The radiation which is of most concern is artificial radiation which results from human activities.
最令人担忧的是人类活动造成的人工辐射。
Yet, each year millions of Americans strive for that perfect tan and even spend their hard earned money to purposefully expose themselves to artificial sources of ultraviolet radiation.
然而，每年都有数百万计的美国人为完美的棕色皮肤奋斗，甚至用他们辛苦挣来的钱让他们暴露于人工的紫外线辐射源。
Microclimatic factors including solar radiation, temperature, humidity, and wind and so on in artificial rainforest were studied.
以纯胶林、胶茶人工林及旷地为对照，分析了人工雨林的小气候效应。
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