One clear trend stands out: Mental distress tends to linger longer after man-made disasters, like an oil spill or radiation leak, than after purely natural ones, like a hurricane.
一个突出的趋势是：人为灾难，像石油泄漏和辐射泄漏，造成的心理疾病比自然灾害，像飓风，导致的精神压力持续时间更长。
But the usual causes of natural variability do not seem to explain the current trend, so scientists incline to the view that it is man-made.
但通常的自然变异原因似乎解释不了目前的趋势，所以，科学家倾向于认为这是人为的。
The article introduces the development trend of domestic man-made lawn, selecting method and notice concerned man-made lawn building.
本文介绍了国内人造草坪的发展趋势，选择人造草坪的方法和有关人造草坪建设的注意事项。
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