除去参加社交活动，戴双将大部分课余时间都花在了课本和练习题上。

Apart from participating in social activities, Dai spends most of his spare time reading course books and doing exercises.

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他已经将靴子换成了一双牛津浅帮鞋。

He had changed his boots for a pair of Oxfords.

《柯林斯英汉双解大词典》

我们将能够飞去上班，打印出一双新鞋或将汽车举过头顶。

We will be able to fly to work, print out a new pair of shoes or lift a car above our heads.

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Now, chlorine I have to do a little bit more heavy lifting here because chlorine starts as a diatomic molecule.

现在，对于氯,我将会做更多的说明,因为氯元素起初存在于双原子分子中。

麻省理工公开课 - 固态化学导论课程节选

And one of the things neophytes trip over early on is that we'll soon see there's not only an equal sign operator, there's equals equals.

这样我们还要引入了一个新的操作符,我们将看到这里不仅有一个等号的操作，还有双等号。

哈佛公开课 - 计算机科学课程节选

On the side over here shows a cell membrane and so this is outside the cell above it, and this is inside the cell below, and this is the lipid bilayer that separates the outside of the cell from the inside of the cell.

这边这个表示细胞膜,它的上面代表细胞外部,下面代表细胞内部,这个是脂质双分子层,将细胞内外分开

耶鲁公开课 - 生物医学工程探索课程节选