题目内容
矩阵乘法规则一般不满足乘法交换律。
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海森堡发现，动量和位置这两个物理量不可能同时测准。
Choose the most suitable translation for every original sentence.Once you’ve got a few years on you, it’s easy to think you’ve heard it all.
It’s hard to feel positive about a stage of life when you spend every year leading up to it assuming that it’s going to be grim.
That, of course, is a great way to ensure that grim is precisely what it becomes — but the inverse is also true.
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