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。
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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