I've just revised my original post.

回答: Idiomatic English for Immigrantsrenqiulan2022-12-03 18:08:15

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Trial and error! (BTW,是这么说吗?我昨天刚学的:) -妖妖灵- 给 妖妖灵 发送悄悄话 妖妖灵 的博客首页 (0 bytes) () 12/04/2022 postreply 10:44:35

Thanks. I would say, "Tune it up." -renqiulan- 给 renqiulan 发送悄悄话 (0 bytes) () 12/04/2022 postreply 12:07:00

谢谢,学习了,是精益求精的意思吧? -妖妖灵- 给 妖妖灵 发送悄悄话 妖妖灵 的博客首页 (0 bytes) () 12/04/2022 postreply 12:14:41

This idiom has much to do with musical instruments. -renqiulan- 给 renqiulan 发送悄悄话 (0 bytes) () 12/04/2022 postreply 14:09:57

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