Your practical Astronomy examination will, of course, take place at night.

你们的天文实践考试当然会在晚上考.

They had to wait until evening for their practical Astronomy; the afternoon was devoted instead to Divination.

他们必须等到晚上才能进行天文学实践考试，所以下午就改为占卜考试了。

Swithin spoke very earnestly to Louis, and did not observe the tender reproach in Viviette's eyes when he showed by his tale his decided notion that the prime use of dark nights lay in their furtherance of practical astronomy.

Swithin 非常认真地对 Louis 说话，并没有注意到 Viviette 眼中温柔的责备，当他通过他的故事表明他的坚定观念时，黑夜的主要用途在于它们对实用天文学的促进。