名词
1. Food and clothing are necessities of life.
食物和衣服都是生活的必需品。
2. She felt the necessity of accepting the invitation.
她感到必须接受这一邀请。
3. Night follows day as a necessity.
白天过去，夜幕降临，这是必然的。
4. She is now in necessity.
她现在很穷。
5. Water is a necessity of life.
水是生命必不可少的。