normal undertaking是什么意思 normal undertaking怎么读
normal undertaking的用法和样例
- The cosmological redshift is not a normal Doppler shift.
宇宙学的红移并不是平常的都卜勒偏移。 - When two Americans meet for the first time-it is normal for them to call each other by their given names immediately.
两个美国人初次见面，很快就直呼其名是很平常的事。
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