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.
然而一旦你开始跑步，你将不会再注意到下雨。
Once you're running, you won't even notice the rain anymore.
虽然说天气有好转了，但我知道，一旦遇到下雨天才是真是的寒冷的开始。
Though the weather becomes better, but I am aware that once it rains, that will be the start of the real cold days.
一旦长时间不下雨，村们将没有水喝。
Once a long time it does not rain, the village will be no water to drink.
一旦明天下雨，我们就呆在家里。
一旦明天下雨，我们就呆在家里。
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