| 1. | This handy pocket dictionary is a boon to me .
这本灵便的袖珍词典对我很有用处。 |
| 2. | It is very useful to use a miniature reflex camera .
使用小型反光镜照相机很有用。 |
| 3. | The frame is a very useful one .
那个框子还很有用。 |
| 4. | A very useful quantity is the half-time for the reaction .
一个很有用的量是反应的半衰期。 |
| 5. | This dictionary is very useful , only it is a bit costly .
这本词典很有用，只不过贵了些。 |
| 6. | It is ever such a tool .
这工具很有用。 |
| 7. | Police attach credence to the report of an unnamed bystander .
警方认为一位不知姓名的目击者的报告很有用。 |
| 8. | Let us begin by making two immediate but very powerful observations .
让我们从两个显然的但很有用的结果开始。 |
| 9. | This feed is of special value in steaming up the ewes as they come to lambing .
这种饲料对即将产羔的母羊补充营养很有用。 |
| 10. | " device " is often used implying approval of a useful machine or instrument .
“device”常含褒义，指某机器或工具很有用处。 |
