in vain attempt to do是什么意思啊..

in vain attempt to do是什么意思啊.. in one's attempt to do in one s attempt to do scientists tried in vain to do these experiments,翻译 attempt to do 和attempt doing 的区别? attempt 既然是及物动词为什么能attempt to do attempt to do 和attempt doing 有什么分别? Vain 是什么意思 attempt to do 和try to do 的区别 try to do与attempt to do意思一样? 英语翻译除了try to do sth 和 attempt 之外还有什么啊 They tried to silence the _____ audience but in vain.