一天之内，晴雨的交替可达数十次，一旦下雨就是瓢泼大雨。
During a single day, it can rain and shine a dozen times. And when it rains it pours.
桂林是个多雨的城市，偏偏有这样的敞篷公交车，一旦下雨，座位上全是积水。
Guilin is a rainy city. If it rains, the seats are full of water.
因为你做环氧地板材料波纹屋面通常很薄，他们可以很嘈杂一旦下雨，雪或其它极端天气条件。
Do it Yourself Epoxy Floors Because corrugated roofing materials are usually very thin, they can be very noisy when it rains, snows or other extreme weather conditions.
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