B. Open the umbrella if it rains.

如果下雨了，把伞撑开。

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"Having to open the umbrella to leave, a female student said:" Teacher, your umbrella can take two individuals, we go together!

说完打开伞要走，一个女同学说：“老师，你的伞可以带两个人，我们一起走吧！”

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It has a built-in electric motor which can open or close the umbrella on demand.

它有一个可以根据需要开合雨伞的内置电动马达。

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There were even pre-round shenanigans when Bradley went into the champions' locker room Thursday morning to find his clubs spread out on the floor and his open umbrella near his empty golf bag, courtesy of Dufner.

WSJ: Keegan Bradley shoots course-record 60 at Nelson

And finally I get dressed, I go downstairs and I'm walking out to the car, and my umbrella blows open -- and I'm soaked.

WHITEHOUSE: The White House

Mr. Steely White, who cycled up to Barclays jauntily holding an open umbrella and riding a black matte Dutch commuter bike whose weight he estimated at about 50 pounds, said the valet service has been a hit in other bike-friendly locales.

WSJ: Barclays Pedals Bike Valet Service