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Dhaka is regularly hit by tropical cyclones and floods , yet it has few defences in place .

达卡经常遭到热带气旋和洪水的打击，然而该市只有很少的防护措施。

Cyclones regularly strike during australia 's summer and often force offshore oil and gas platforms to suspend operations .

澳大利亚在夏天经常遭到气旋袭击，导致沿岸石油平台和气井钻台被迫中止运作。

That in turn may increase the severity of tropical cyclones , which throw more water into the stratosphere .

高温转而可能会使热带气旋更加猛烈，而热带气旋又向同温层投入更多的水。

Tropical cyclones will become more frequent as the atmosphere becomes warmer and richer in co2 , climatologists predict .

气候学家预言，由于大气温度越来越温暖，二氧化碳含量越来越高，热带气旋的形成也将越来越频繁。

Tropical cyclones derive energy from warm ocean waters , while posttropical cyclones are fueled by temperature contrasts in the atmosphere .

热带气旋的能量来自温暖的海水，而后热带气旋则是由大气中的温度反差造成的。