发生: 1.happen; occur; take place; arise; crop up; chance; befall; come off; come to pass; come about; come up; come what may; be set; turn up; bring to pass:2.germination; occurrence3.-gony; -p
实验: experiment; test; trial run 短语和例子动物实验 animal experiment; 进行科学实验 conduct scientific experiments; 声学实验 test in sound; 用青蛙做实验 experiment (upon) on frogs; 富兰克林的实验表明闪电是一种放电。 franklin's experime
