The direction switch is provided with an up key, a down key, a left key and a right key.

所述的方向开关分别是上按键、下按键、左按键、右按键。

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But when you need to switch from one operating system to another-be it because of a change in business direction, technology enhancements, or cost savings-making the switch can be tough.

但是，当您从一种操作系统转换到另一种(可能是因为业务方向发生变化，技术增强，也可能是为了节约成本)，完成转换会非常困难。

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We also installed a chemical switch that allowed the electron transfer process to proceed in the opposite direction.

我们同样按照了一个化学开关，它可以允许电子交换过程以相反的方向进行。

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The terrain in these neighbourhoods is steep, so escalators operate one way in the morning for commuters and switch direction before lunch.

BBC: Living in: Hong Kong

It was the cue for the Robins to move up a gear as Galea's sharp switch in direction and hand-off got them off the mark on seven minutes and handed Dobson an easy conversion.

BBC: Hull KR 25-6 Leeds

But he has played most of his professional rugby in Australia at full-back and his performances following the switch to fly-half brought much criticism in his direction.

BBC: Cardiff Blues recruit Dan Parks from Glasgow Warriors