As this occurs, valve springs pull the valve tightly closed against its opening, called the valve seat.
当这发生时，气门弹簧紧紧地封闭气门口，叫做气门座。
If you let a baby grasp a rod and try to pull it away, he will cling more and more tightly until his whole weight is suspended.
如果你让一个婴儿抓住一根竿子，然后试着把竿子抽出来，孩子就会越抓越紧，直到他们整个重量都依附于此。
Pull both sides tightly so the paper hugs your package smoothly, and tape closed.
两边拉紧从而纸平滑地裹在你的礼品盒上，然后用胶带粘住。
Big diameter pipe can be composed of several round steel brush together, at both ends with wire tightly, within the lumen pull brush back and forth, until the metal color, reoccupy cotton brush clean.
大管径管子可由几个圆钢刷组装在一起，两端用铁丝扎紧，在管腔内来回拉刷，直至露出金属本色，再用棉纱拉刷干净。
As this occurs, valve springs pull the valve tightly closed against its opening, called the valve seat.
当这发生时，气门弹簧紧紧地关闭气门口，叫做气门座。
As this occurs, valve springs pull the valve tightly closed against its opening, called the valve seat.
当这发生时，气门弹簧紧紧地关闭气门口，叫做气门座。
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