We shed skin constantly — each of us replacing our outer layer of skin every two to four weeks — and all of those skin flakes may help reduce levels of certain pollutants in indoor environments.
我们的皮肤在不停地剥落——每个人每两到四周就会更换一次表层皮肤——而所有那些脱落的皮肤可以帮助减少室内环境中的某些污染物含量。
For the purpose of demonstration, I've implemented four levels, ranging from blocking nothing to blocking every new window.
为了演示的目的，我已经实施了四个级别，从阻止无关阻止每一个新的窗口等。
The electricity minister said the cuts, lasting up to four hours every other day, would prevent water levels at Venezuela's main hydro-electric dam from falling too low.
电力部长称，断电长达每天四小时，可以避免委内瑞拉主要的水力发电站的水位下降的过低。
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