他总是随身带把雨伞以防下雨。
她总是随身带着把伞，以防下雨。
你最好带把伞在身边以防下雨。
我也没忘带上一件防水夹克，以防下雨时需要步行。
I included a waterproof jacket in case I needed to walk to school in the rain.
你离开实验室前必须关上门窗以防下雨。
The doors and Windows are to be shut in case of rain before you leave the lab.
他带上了雨衣以防下雨。
你最好带把伞，以防下雨。带张地图，以防走失。
You'd better take an umbrella, in case it rains. Take a map in case you get lost.
伦敦的天气很多变，人们总是要随身带着雨伞以防下雨。
The weather in London is so changeable that people always bring their umbrella with them for fear of rain.
伦敦的天气很多变，人们总是要随身带着雨伞以防下雨。
The weather is changeable in London so the people always take an umbrella along in case of rain.
伦敦的天气很多变，人们总是要随身带着雨伞以防下雨。 。
Thee weather in London is so changeable that people always bring their umbrella with them for fear of rain.
可能下雨- - -你最好带把伞，以防万一(下雨)。
我拿着一把伞，以防一会儿下雨。
汤姆和莎莉觉得应该不会下雨，不过他们还是带了雨伞以防万一。
Tom and Sally didn't think it would rain, but they brought along an umbrella just in case.
天可能不会下雨，不过我还是带把伞吧，以防万一。
It may not rain, but I'd take an umbrella along, just in case it should rain.
我拿着一把伞，以防一会儿下雨。
可能会下雨你，最好带把伞，以防万一。
It may rain-you'd better take an umbrella (just) in case it does.
天空看起来很晴朗，可是我还是要带雨伞以防万一下雨。
The sky looks clear; however , I shall take an umbrella just in case it should rain.
延迟所起到的作用就是在雨停后，使得通风口在雨水位置保持几分钟的时间，以防止又开始下雨。
This delay is used to force the vents to stay in the rain position for a few minutes after it stops raining, in case it starts raining again.
这个车哪里都好，但就是少了一个密封的零件，所以每当下雨天，史蒂芬不得不在该零件的位置涂上凡士林以防漏雨。
He finally finds one for a great price, but it's missing a seal, so whenever it rains, he has to smear Vaseline over the spot where the seal should be.
棉布可以防止太阳把洋葱完全晒干。不要担心下雨，不要使用塑料或帆布覆盖。严实覆盖物可以锁住水分防止洋葱完全晒干。
And do not use a plastic or canvas sheet. Heavy coverings will trap moisture and keep the Onions from drying fully.
夜间有时会突然打雷下暴雨，出门时最好带上雨伞，天晴时可遮挡强烈的阳光以防晒伤皮肤，下雨时可遮雨以防淋湿衣服，一举两得。
The thunderstorms that come frequently at night mean it is advisable to take an umbrella when going out. The umbrella doubles as shelter from UV rays when it is too hot and sunny during the day.
可能下雨——你最好带把伞，以防万一(下雨)。
It may rain-you'd better take an umbrella (just) in case (it does).
伞在下雨的时候可以防止你被淋湿。
伞在下雨的时候可以防止你被淋湿。
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