1.perpetual adj. 不间断的；持续的；长久的；无尽无休的；没完没了的
例句：I thought her perpetual complaints were going to prove too much for me.
我想我再也受不了她无休无止的抱怨了。
2.perish v. 毁灭；死亡；丧生
例句：A family of four perished in the fire.
一家四口死于此次火灾之中。
例句：This system sets the pattern for others to follow.
这个系统堪为他人仿效的典范。
例句：She made periodical visits to her dentist.
她定期去看牙医。
例句：He held a great number of patents for his many innovations.
他拥有多项发明的专利权。
