随着时间的推移，毛囊就会发生改变并收缩，导致头发稀疏。
Over time, the hair follicles will change and shrink, leading to thinning hair.
Blue甚至允许您动态地扩展类并收缩类(即移除已扩展的类的属性)。
Blue even allows you to extend classes dynamically and contract them (that is, remove class attributes from an extended class).
冷水洗涤比干洗更好。干洗没法去除气味，而高温和化学溶剂会溶解防水层并收缩粘合。
Cold water washing is preferable to dry cleaning. Dry cleaning will not remove odors, and the heat and chemical solvents can dissolve the waterproofing and shrink the bindings.
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