You have to shift down to climb steep hills.

大型卡车在爬陡坡时，需要换低速档。

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You have to shift down when you climb up steep hills.

开车爬陡峭的山坡时，你得换慢挡。

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You have to shift down to climb steep hills.

汽车爬陡坡得换低挡。

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You have to shift down to climb steep hills.

汽车爬陡坡得换低挡。

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