| 31. | a vain attempt |
| 劳而无功的努力
|
| 32. | in the vain hope of persuading him |
| 指望说服他而徒费口舌
|
| 33. | try in vain to sleep |
| 怎么也睡不着
|
| 34. | an empty [an idle, a vain ] boast |
| 空洞的夸耀，虚夸的言辞
|
| 35. | in a vain bid |
| 妄图
|
| 36. | after vain argument with sb |
| 在与某人进行无益的争论之后
|
| 37. | the vain Endeavour |
| 徒然尝试；妄图
|
| 38. | a vain expectation of success |
| 对成功的徒然期望
|
| 39. | make vain resolution never to repeat the act |
| 多次徒劳地下决心永不重复那一行为
|
| 40. | take sb.'s name in vain |
| 滥用某人的名义；在背后议论某人[说某人的闲话]
|