副词短语
中文翻译：那时
同义词：
['at that time', 'by that time', 'up to that point例句：1. By then', 'the sun had set.（到那时，太阳已经落山了。）2. We will meet again by then.（我们到那时还会见面。）']
例句：
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1. By then, the sun had set.
到那时，太阳已经落山了。
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2. We will meet again by then.
我们到那时还会见面。
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3. He decided to leave by then.
他决定到那时就离开。