这些水库的情况多是如此： 在雨水少的时候干涸，在洪水到来的时候则因蓄水量到达顶峰而没顶。
In many cases, this means they are so heavily silted that they dry up when the rains cease and flood during summer when they reach their peak.
灰尘限制了到达地表的太阳辐射数量，举例来说，会减缓因二氧化碳浓度增高而缠身滚的大气温室效应。
Dust limits the amount of solar radiation that reaches the Earth, for example, a factor that could mask the warming effects of increasing atmospheric carbon dioxide.
当时，灭火的云梯不能到达大楼中部略上的位置，救援的直升机也因大火的浓烟阻挡。
Fire ladders were unable to reach the upper half of the building, and rescue helicopters were hampered by smoke.
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