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1·What time does it get dark in summer?

夏天什么时候天黑？《牛津词典》

2·Usually, you must sleep for at least seven to eight hours every day, or you will get dark circles under the eyes.

通常，你必须每天至少睡7-8小时，否则你会有黑眼圈。

3·It had begun to get dark, and Peter knew that it was time to go.

天开始黑了，彼得知道他该走了。

4·We had got only halfway when it began to get dark.

走到半路，天就黑了。《新英汉大辞典》

5·It was beginning to get dark.

这时天色开始暗下来。

6·Does the sun ever get dark during the day?

太阳白天也会变黑吗？

7·We are hungry, and if it get dark, so much the worse.

我们都饿了，如果天再黑下来，那就更糟糕了。

8·The three of them walked on until it started to get dark.

三人于是同行直到天色开始变暗。

9·In summer it doesn't get dark until after eight o 'clock.

夏天，直到八点过后，天色才暗下来。

10·Once I walked through the woods when it began to get dark.

有一次我在天将暗时，独自穿越树林。