拉住抓环，地铁有时候会突然刹车。

Oh, Hold on the strap, The subway stops suddenly sometimes.

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拉住抓环，地铁有时候会突然刹车。

Hold on the strap. The subway stops suddenly sometimes.

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文章叙述了保障系统中的飞机环控、机轮刹车、燃油、液压和公共管理系统的现代水平和发展趋势。

In this paper, the status and trend of aircraft environment control, wheel -brake, fuel, hydraulics and utility management systems are presented.

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主营：皮带、轮胎、内胎、汽缸、活塞、活塞环、火花塞、电门锁、轮古、轴承、空气芯、刹车皮、拉索线、离合器、波盘、气门。

Main: belts, tires, inner tubes, cylinders, pistons, piston rings, spark plugs, power door locks, Lungu, bearings, air core, brake pads, cable lines, clutch, odds, valve.

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主营：皮带、轮胎、内胎、汽缸、活塞、活塞环、火花塞、电门锁、轮古、轴承、空气芯、刹车皮、拉索线、离合器、波盘、气门。

Main: belts, tires, inner tubes, cylinders, pistons, piston rings, spark plugs, power door locks, Lungu, bearings, air core, brake pads, cable lines, clutch, odds, valve.

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