I turned over the cover of the notebook, wrote a few words of encouragement naturally and signed my name.
我翻开笔记本的封面,自然地写了几句鼓励的话,签上了自己的名字。
我转过头。
By accident, I turned over a book.
我无意间翻开一本书。
It wouldn't be the same if I turned it upside down because the carbons - the rings here, the pentose's would all be turned over, the chemistry would look different and the sequence of bases would look different.
记住单链倒过来,就和原来不一样了,这是因为碳原子和糖环结构,戊糖会翻转,使得这个化学结构看起来不一样了,碱基的顺序也不一样了
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