She is widely regarded as the current leader's natural successor.
人们普遍认为她是现任领导的当然继任者。
《牛津词典》
2
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。
3
Under anaerobic conditions (where oxygen is absent) they metabolise the fuel by feeding off it and in doing so produce natural chemical reactions that produce a current.