单词	gearbox
释义	gearbox /ˈɡɪəbɒks / noun A set of gears with its casing, especially in a motor vehicle; the transmission: a four-speed gearbox... Effectively the gearbox engages the next highest gear but does not activate it until the optimum point has been reached. These are available with either five or six-speed manual gearboxes with an optional six-speed tiptronic automatic transmission. The manual gearbox has a tendency to be notchy and the auto gearbox doesn't change particularly smoothly.
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