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

让我们在两个最流行的单位，仔细看看，在窗户和双悬窗。

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Typically Bay window is consisted of three Windows joined together. The center window is usually fixed, with operating double-hung or casement Windows at the sides.

典型的弓型窗是由三扇窗组合而成。中间为固定窗，两侧为提拉窗或平开窗。

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