| 1. | His wife is very useful at cooking .
他的妻子很会做菜。 |
| 2. | His wife is very useful at cooking
他的妻子擅长烹调。 |
| 3. | My wife is very useful at cooking
我的爱人很会做饭。 |
| 4. | If that were what digital signatures were like , then they wouldn t be very useful at all
如果数位签章就是像这样的，那么它们根本就没什么用。 |
| 5. | Which are very useful at first sight and save a lot of duplicated code , but make programs incomprehensible over time
，初看之下，它非常有用，可以节省大量重复的代码，但它会使程序变得越来越难以理解。 |
| 6. | As a kind of important hydraulic structure , hydraulic tunnel is very useful at many aspects such as conveyance , diversion and flood discharge
水工隧洞作为一种重要的水工建筑物，在输水、导流及泄洪等方面起着重要的作用。 |
| 7. | Range estimates from the foretop would not have been very useful at that time , especially given the decimated gun crews and difficulties relaying data . ( flags were probably used from the foretop to the gun )
这种测距方式并不精准，特别是在船身剧烈摇晃或者是火炮烟硝阻碍观测视线的时候。 ） |
