看了一篇文章,说得挺好,但是有一点不是很确定, d6 z k+ d: S0 I: J* P
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16. Manage Your Speed; I& P. `- q. Y' A7 f! @) g
If you drive a car with automatic transmission, use cruise control to manage your speed and conserve fuel.! ~ e P' r8 ?5 v3 p( r% B4 N