她坐在后排平时惯坐的位子上。

She sat in her usual seat at the back.

《牛津词典》

我们坐在后排。

We were sitting in the back row.

《牛津词典》

走近汽车时，他注意到有五个老太太，两个坐在前排，三个坐在后排，眼睛睁得大大的，脸色苍白。

Getting closer to the car, he noticed that there were five old ladies, two in the front seat and three in the back, wide eyed and pale faced.

youdao

We're asking the question, taking S2 as given, what S1 maximizes this expression and as the gentleman at the back said, I'm going to differentiate and then I'm going to set the thing equal to 0.

我们来讨论在S2已知的情况下,S1的最大值是多少,就像坐在后排的先生说的那样,我们要去求导然后令导数等于0

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