| 1. | You can erase pencil marks with a rubber .
你可以用橡皮擦掉铅笔记号。 |
| 2. | He x-ed his ballot clearly .
他在选票上清清楚楚地勾下了选择的记号。 |
| 3. | A recorder pen makes a mark on a chart .
记录器的笔在记录卡上划一个记号。 |
| 4. | He ticked off the items one by one .
他把这些项目一个一个地用小记号标出。 |
| 5. | We badly need some notation .
我们很有必要规定一些记号。 |
| 6. | She x-ed out most of what she had written .
她用x记号划掉了已经写出的大部分文字。 |
| 7. | It is conventional male symbol .
那通常是雄性记号。 |
| 8. | It was obvious that the two shells had different markings .
两颗弹壳显然有不同的记号。 |
| 9. | We shall find it convenient to adopt the following notation .
采用下面的记号是方便的。 |
| 10. | The advantage of this notation is that it is unambiguous .
这种记号的优点在于它不会混淆。 |
