接近华氏100 度的高温使他们感觉热得难受。
这个城市机场的能见度下降到了零，使航空运输陷入停顿状态。
Visibility at the city's airport came down to zero, bringing air traffic to a standstill.
生态学家曾一度认为，物种多样性使生态系统变得稳定。
At one time, ecologists believed that species diversity made ecosystems stable.
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