On dark nights children should wear reflective clothing.

在漆黑的夜晚，儿童应该穿可以反光的衣服。

《牛津词典》

If it's dark when you exercise outside, wear reflective clothing.

如果天色暗时在室外锻炼，则需要穿上可以反光的衣服。

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No matter your age or mode of transportation, you should be visible, with bright or reflective clothing, plus lights if it's dark out.

不管你年龄抑或交通方式，必须使别人看的到你，穿着亮色或反光衣服，夜间时须配车灯。

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Ministers had no intention of making the wearing of reflective clothing or helmets a legal requirement for cyclists, Earl Attlee said.

BBC: Cyclists and Motorists debate

He said riders should wear a minimum of protective clothing, such as a helmet and reflective clothing, and be required to take out third party insurance.

BBC: Cyclists and Motorists debate

Experts agreed that parents should exercise normal caution for trick-or-treating, such as checking candy and treats before their children eat them and making sure children wear reflective clothing at night.

CNN: Most parents not overly concerned this Halloween