Almost all amino acids that make up biological proteins, for instance, are left-handed, so a self-replicating biological molecule of right-handed chirality could be suggestive of an alien organism.
比如说，几乎所有构成生物蛋白的氨基酸都是左手性的，所以出现右手手性的自我复制生物分子可能意味着发现了外星生物体。
They're busy! They have to be up early and they work late! Those are explanations I've been handed.
他们忙！他们必须起早贪黑！这就是我得到的解释。
Microthemes must be handed in during the class when they are due, and, except for extraordinary circumstances, may NOT be made up.
小短文必须在作业缴交期限的该堂课前交出，而且除了非常状况之外，不接受补交。
Microthemes must be handed in during the class when they are due, and, except for extraordinary circumstances, may NOT be made up.
小短文必须在作业缴交期限的该堂课前交出，而且除了非常状况之外，不接受补交。
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