帮忙翻译一段专业英文

However, as specified in the thruster data sheets, the thruster current reverses itself before becoming zero.
然而，半导体闸流管数据表显示，半导体闸流管电流在降到零之前产生反向电流。
The important parameter is not the time it takes for the current to become zero from its negative value, but rather the turn-off time interval t1 from the zero crossover of the current to the zero crossover of the voltage across the thruster .
这个重要的参量的意义不在于它因产生反向电流导致电流到零的时间的延长值,而是由于半导体闸流管造成的关闭电源时电压降到零与电流降到零之间的时间差T1..

During t1 a reverse voltage must be maintained across the thruster and only after this time is the device capable of blocking a forward voltage without going into its on-state.
在t1期间,通过半导体闸流管维持一反向电压，并且正是在这之后,设备易于保持一正向电压，而无需开启电源。
If a forward voltage is applied to the thruster before this interval has passed, the device may prematurely turn on and damage to the device and circuit could result.
如果在这间隔时间结束之前加一正向电压到半导体闸流管，设备可能过早地启动，并可能导致设备和电路损坏。
Thruster data sheets specify t1 with a specified reverse voltage applied during this interval as well as a specified rate-of-rise of voltage beyond this interval. This interval t1 is sometimes called the circuit-commutated-recovery time of the thruster.
半导体闸流管数据表显示，在t1间隔时间期间生成一特定的反向电压以及这间隔时间随之而来的率上升特性的电压。 这间隔时间t1有时叫半导体闸流管的电路换向恢复时间。
Depending on the application requirements, various types of thruster are available. In addition to voltage and current ratings, turn-off time t1,and the forward voltage drop, other characteristics that must be considered include the rate-of -rise of the current (di/dt) at turn-on and the rate-of -rise of voltage (du/dt)at turn-off.
根据应用程序要求，各种各样半导体闸流管被利用。除电压和电流参量，岔开的时间t1和正向电压降压之外，必须考虑的其他特征，包括开启时电流上升率(di/dt――单位电流与单位时间的比值)，和切断电源时电压上升率(du/dt ――单位电压与单位时间的比值)。

但是, 依照被指定在可控硅整流器数据表, 可控硅整流器当前的相反在它需要为潮流对ecome 零从它的negatiive 价值的成为的zero.The imprtant 参量之前不是时间, 但岔开的间隔时间t1 从潮流的零天桥对电压的零天桥横跨thyristor.During t1 反向电压必须宁可被维护横跨可控硅整流器并且在这时间之后在设备能阻拦向前电压没有进入它在state.If 向前电压适用于可控硅整流器在这间隔时间通过了之前, 设备也许过早地打开并且对设备和电路的损伤能result.Thyristor 数据表电压以及被指定率上升电压在这interval.This 间隔时间t1 之外有时叫可控硅整流器的申请了在这间隔时间期间电路换向补救时期。
根据应用要求, 各种各样的类型可控硅整流器是availale.In 加法对电压并且当前评级, 岔开的时间t1, 和向前电压下落, 必须被考虑的其它特征包括率- 潮流的上升(di/dt) 在刺激和率- 电压(du/dt)at ruen-off 的上升。

然而，正如在半导体闸流管的数据单表中所指定的，闸流体电流在转为零之前却倒退了。一项重要指标认为电流出现零的情况应该是在出现负数之后，而不是在零之前，。。。

sorry，我自己都弄不清了，也别误导你了。
呵呵

然而,根据晶闸管数据表,在晶闸管电流为零之前其电流将会转向.这个重要参数并不是指电流由负值变为零值的时间,而是指由电流为零到电压为零时,通过晶闸管的关断时间值t1.在t1时间段中,反向电压在晶闸管中必须保持通过状态,而且只有在此之后器件的正向电压模块才能起效而无须开态.如果正向电压早于此关断时间通过晶闸管,就会造成器件因过早开启而损坏并造成短路.晶闸管参数表规定了特定的反向电压在关断间隔时发生作用的时间t1以及超过这个关断间隔的特定升值电压.在晶闸管中t1有时也被叫做电路恢复时间.
根据应用的要求,有多种不同型号的晶闸管可供选择.另外除了电压,电流和关断时间t1,衰弱正向电压和其他参数包括升值开态电流(di/dt)和升值关态电压(du/dt)等参数也要考虑在内.

可能翻译的不是太准确,因为有的参数专业名词不是很到位,但是希望对你有帮助:)

18942263132：甯繖缈昏瘧涓娈寰涓撲笟鐨鑻辨枃,璋㈣阿浜,鍦ㄧ嚎绛
经阎：绛旓細Aerated concrete block; wall cracks; crack control銆

18942263132：姹傞珮鎵甯繖鑻辫缈昏瘧,涓灏娈典笓涓氳嫳璇
经阎：绛旓細specialization, centralization. Production of high mechanization and automation inevitable requirement of supply and distribution of goods should be timely, quickly, accurately. Three-dimensional warehouse technology can be quickly to the development and application of plant design...

18942263132：甯垜鎶婁笅闈涓娈璇缈昏瘧鎴鑻辨枃`瑕涓撲笟涓鐐瑰痉`
经阎：绛旓細We need to study 鏍峰搧 Sample

18942263132：甯繖缈昏瘧涓涓,澶т竴鑻辫璇炬湰涓婄殑鍙ュ瓙~瑕涓撲笟涓鐐圭殑,鎴戝ぇ閮ㄥ垎閮芥噦鍙槸鏈...
经阎：绛旓細1銆丄t this point in their development toddlers begin to diverge from one another in their overall sensitivity to other people鈥榮 emotional upsets锛 with some, like Jenny, keenly aware and others tuning out.鍦ㄥ绔ユ垚闀跨殑杩欎釜闃舵锛屼粬浠紑濮嬪浠栦汉鎯呯华涓婄殑浣庤惤鏈変笉鍚岀殑鏁忔劅搴︼紝鏈変簺锛屽儚Jenny...

18942263132：璁＄畻鏈涓撲笟鐨勭畝鍗鑻辫娈佃惤缈昏瘧
经阎：绛旓細The most important system software that runs on a computer is the operating system.Every general-purpose computer must have an operating system to run other programs.Operating systems perfrom basic tasks ,such as recognizing input from the keyboard,sending output to the display screen,...

18942263132：鏈夎皝鑳藉府鎴戞妸涓嬮潰鐨涓娈璇缈昏瘧鎴鑻辨枃,灏介噺鐢涓撲笟鏈,璋㈣阿
经阎：绛旓細condition the normal growth, and can display the normal 鑲叉 transformation situation, 鑲叉 the transformation time is longer.Broadcasts the time to look, Henan warm photosensitive BNYL material in November 10 before sows seeds sterile rate nearly to achieve 100%,the sterility nearly ...

18942263132：杩欐槸涓娈闊充箰涓撲笟鑻辫,璋佽兘甯垜缈昏瘧?
经阎：绛旓細begin on the first beat, or on or between any other beats of a measure.涓涓珷鑺傚彲浠ヤ互绗竴涓妭鎷嶅紑濮嬶紝鎴栬呭湪绌挎彃鍦ㄤ竴涓紙闊充箰鐨勶級搴﹂噺褰撲腑鐨勪换鎰忚妭鎷嶅綋涓傚悗澶╁氨瑕佹湡鏈冧簡锛岀幇鍦ㄨ繕鍦ㄨ繖閲甯浣缈昏瘧锛屽懙鍛点傚叾涓湁浜涘湴鏂圭炕璇戝緱涓嶆槸寰堝ソ锛屼綘灏变笉瑕佽鎬傚弬鑰冭祫鏂欙細鑷繁鍛曞績娌ヨ缈昏瘧鍑烘潵D~~~

18942263132：甯繖缈昏瘧涓娈典笓涓氳嫳鏂
经阎：绛旓細During t1 a reverse voltage must be maintained across the thruster and only after this time is the device capable of blocking a forward voltage without going into its on-state.鍦╰1鏈熼棿,閫氳繃鍗婂浣撻椄娴佺缁存寔涓鍙嶅悜鐢靛帇锛屽苟涓旀鏄湪杩欎箣鍚,璁惧鏄撲簬淇濇寔涓姝ｅ悜鐢靛帇锛岃屾棤闇寮鍚數婧愩侷f a ...

18942263132：鎬ラ渶楂樻墜甯鎴缈昏瘧浠ヤ笅璁＄畻鏈鑻辫涓撲笟鍙ュ瓙
经阎：绛旓細4銆丄 word processor enables you to create a document,store it electronically on a disk,display it on a screen,modify it by entering commands and characters from the keyboard,and print it on a printer.WORD 鏂囧瓧澶勭悊鏈鸿兘璁╀綘鍒涘缓涓涓枃妗ｏ紝骞朵互鐢靛瓙褰㈠紡淇濆瓨鍦ㄧ洏涓婏紝鍦ㄥ睆骞曚笂鏄剧ず锛岄氳繃...

18942263132：姹傞珮鎵甯繖缈昏瘧涓嬮潰鍑犳鐨勭數姘涓撲笟鑻辫銆傘傘傝阿璋簡
经阎：绛旓細are:瀵圭О閮ㄤ欢鐨勪竴涓父瑙佸簲鐢ㄦ槸鍦ㄨ绠椾笉骞宠　鐭矾浜х敓鐨勭數娴併傚浜庝笁鐩哥郴缁燂紝鍙兘鐨勪笉骞宠　鏁呴殰鏈夛細1. Single line-ground,鍗曠嚎瀵瑰湴 2. Double line-ground,鍙岀嚎瀵瑰湴 3. Line-line.绾块棿 These are considered separately.杩欎簺鍒嗗紑杩涜鑰冭檻 7.1 Single Line-To-Ground Fault 鍗曠嚎瀵瑰湴鏁呴殰 The situation ...