terminator  
noun [ C ] uk/ˈtɜː.mɪ.neɪ.tər/ us/ˈtɝː.mə.neɪ.t̬ɚ/
  (END)      
  终结…的人或物
someone or something that terminates (= ends) something
  The article described Yeltsin as a terminator of the Soviet system. 文章将叶利钦描述为苏联体制的终结者。 
 Certain words and characters are interpreted as commands, separators, or command terminators. 某些单词和字符被解释为命令、分隔符或命令终止符。 
 - More examples
 - Politically, he needs a mediator not a terminator.
 - The semicolon is used as a statement terminator.
 - Terminators absorb signals so that they don't get reflected back into the network and cause data corruption.
 
  (MOON/PLANET)      
 physics specialized明暗分界线,昼夜分界线 
the line that separates the dark part of the moon or a planet from the part that is lit up
  As the moon rises, the terminator will fall across the crater, and the floor of the crater will be in shadow. 随着月亮升起,明暗分界线将会跨越陨石坑,陨石坑的底部将处于阴影之中。 
 - More examples
 - The terminator is the dividing line between day and night.
 - We ended off the observing session with the moon, where we spent some time along the terminator.
 
See also: terminator gene