气压式高度表测量气压是参照海平面的，透过一连串的真空膜盒、齿轮和弹簧来移动刻度盘上的指针。

The mechanical pressure altimeter measures atmospheric pressure relative to sea level through a series of bellows, gears, and springs, which move Pointers on a dial.

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每个样式表由一连串规则所构成。

Every style sheet is made up of a series of rules.

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每个样式表由一连串规则所构成。

Every style sheet is made up of a series of rules.

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