让我们在两个最流行的单位，仔细看看，在窗户和双悬窗。

Let's take a closer look at the two most popular units, the casement and double hung window.

youdao

让我们在两个最流行的单位，仔细看看，在窗户和双悬窗。

Let's take a closer look at the two most popular units, the casement and double hung window.

youdao