an automotive system for shifting gears in which the gears revolve at the same speed and so shift smoothly
例句与用法
1.
I learned to drive the hard way on a car with a crash gearbox ? there were no synchromesh or automatic gearboxes when i was a lad 我为了学会开车付出了很高的代价，我用了一个应急的汽车变速箱? ?在我小时候没有同步或自动变速箱。
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