请简单说明时延的定义。
参考答案：
时延是指一个报文或分组从源传送到目的地所需的时间。
根据句意和空缺处所给首字母写单词。
1. It is the harvest time. The farmers are b______ getting in the crops.
2. My h____ is collecting stamps. I have collected thousands of stamps.
3. The Chinese people are p____ of the Great Wall. 68._________
4. Mark Twain was born in the USA and English was his mother t______.
5. I'm t________. Could you please bring me a bottle of water.
特应性皮炎
