白天晚上英语怎么说

在英语中，白天称为 "daytime"，晚上称为 "nighttime"。这两个词的来源都可以归结为拉丁语，"daytime" 来自拉丁语的 "diem"，意思是 "白天"，而 "nighttime" 来自拉丁语的 "noctem"，意思是 "晚上"。
例句：
It's a beautiful day. Let's go for a walk during daytime. (白天天气真好，我们可以出去散步。)
I'm usually very tired by nighttime, so I like to go to bed early. (我通常在晚上很累，所以我喜欢早点上床。)