An example of where this can be used is on weekends where workload levels can shift down dramatically.
例如，在工作负载水平很低的周末可以使用这个特性。
You have to shift down to climb steep hills.
大型卡车在爬陡坡时，需要换低速档。
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。
You have to shift down to climb steep hills.
汽车爬陡坡得换低挡。
You have to shift down to climb steep hills.
汽车爬陡坡得换低挡。
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