We always have a spare wheel in our car.

我们总是在汽车上带一个备用的轮胎。

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The scientists plan to use it to replace the metal floor of a Volvo car's boot which holds the spare wheel.

科学家计划用这种材料来取代沃尔沃汽车存放备用轮胎的金属地板。

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Prayer is not a "spare wheel" that you pull out when in trouble; it is a "steering wheel" that directs us in the right path throughout life.

祷告不是“备胎”，在紧急状况下才用的；而是“方向盘”，指引我们人生的方向。

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Also, although it has a bit less cabin volume than the Hummer, that's only if you remove the giant spare wheel and tire from the cabin of the H2.

FORBES: Vehicles Feature

While the reserved Megawati has found her spare-wheel role as vice president to her liking, Rais is still struggling to find his place in the public eye.

CNN: Partners -- As In Sparring

Mr. Warming pointed to another picture of the spare, yet modern, steering-wheel column and single large dashboard dial on an old 1960s Mini, the inspiration for the minimalist dashboard of the Mini Rocketman, an even tinier Mini concept car that made its debut at the Geneva Motor Show in March.

WSJ: Anders Warming: The Man Who Reinvents Wheels | Creating