时去时来，汉语成语，拼音是shí qù shí lái，意思是有时去，有时来，来去不定，出自《史记·孝武本纪》：“时去时来，来则风肃然也。”
比方说，当你想要重新拾起荒废已久的钢琴时，不要多想，去在48小时内找一架来弹吧，看看到底感觉怎么样。
If you think you might want to take up piano again, instead of "thinking about it," just go play one within 48 hours, and see how it feels.
当我们想通过配置、操作或者观察来评估一个产品时，或者当我们试图去识别一个没有预计到的问题时，我们就是在测试。
When we configure, operate, and observe a product with the intention of evaluating it, or with the intention of recognizing a problem that we hadn't anticipated, we're testing.
好长一段时间，她都不理解离婚意味着什么；当我去探望她时，她想要我呆着不走，当她来看我时，她要格特鲁德也一起来。
For a long time, she didn't understand what divorce meant; when I came to visit, she wanted me to stay, and when she came to visit me, she wanted Gertrud to come too.
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