库蚊呼吸管细长，伊蚊呼吸管粗短；按蚊缺呼吸管，但有气门，各腹节背面有掌状毛(float hair)，有漂浮作用。在气温30℃和食物充足的条件下，幼虫期经约5~8天发育，蜕皮4次变为蛹(pupa)。
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Finally she turned on the engine and despite the cold that was outside she opened the window and let her hair float with the wind as she drove her car onto the empty highway.
最后，她启动了引擎，打开车窗，将车开上空旷的公路，任凭窗外的寒风将自己的头发吹散。
A gust of wind blown head on, his hair this which direction to float? East, west, south, or north?
迎面吹来一阵风，他的头发该往哪个方向飘？向东，向西，向南，还是向北。
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