necessary woman

例句：

1. 1. It is necessary to follow the instructions carefully.
   仔细遵循说明是必要的。
2. 2.The teacher asked us to bring our own books because they were necessary for the lesson.
   老师要求我们带自己的书，因为它们对这节课来说是必要的。
3. 3. We need to buy some new clothes as this season's clothes are no longer necessary.
   我们需要买一些新衣服，因为这个季节的衣服已经不必要了。