名词
中文翻译：天
同义词：
['morning', 'afternoon', 'evening', 'night']
例句：
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1. I usually go to bed at 10 o'clock in the morning.
我通常在上午10点睡觉。
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2. The day is getting longer as summer approaches.
随着夏天的到来，白天变得越来越长。
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3. We spent a pleasant day at the beach.
我们在海滩上度过了一个愉快的一天。