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know their right hand from their left

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know their right hand from their left
请高手翻译一下
know their right hand from their left
具体语境是啥
字面意思我认为是知道从左手到右手里的东西
找了段文章
Do you know your right hand from your left? Of course you do – but a surprisingly large number of doctors don’t. This can be a problem if you’re amputating a leg.
Sometimes they get the right and left bit sorted out, but still carry out the wrong procedure on the patient, or they get the procedure right, but on a patient who should never had it in the first place.
这里的意思就是说你知道你在做什么吗?你当然知道——但是让人吃惊的是大多数的医生并不知道自己再做什么,如果你要做截肢手术的话这就成为了一个大麻烦.