I've just revised my original post.
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Trial and error! (BTW,是这么说吗?我昨天刚学的:)
-妖妖灵-
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12/04/2022 postreply
10:44:35
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Thanks. I would say, "Tune it up."
-renqiulan-
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12/04/2022 postreply
12:07:00
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谢谢,学习了,是精益求精的意思吧?
-妖妖灵-
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12/04/2022 postreply
12:14:41
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This idiom has much to do with musical instruments.
-renqiulan-
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12/04/2022 postreply
14:09:57