Could you ring for a cab?

你打电话叫辆出租车来好吗？

《牛津词典》

Please have this ring for a keepsake.

请收下这枚戒指作为信物。

《新英汉大辞典》

In an angry voice, he said: "How do you dare to ring for me?"

他怒气冲冲地说：“你们怎么敢按铃叫我？”

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But if the monsoon is very strong, the trees affected by that monsoon might put on a wide ring for that year.

VOA: special.2010.05.25

He is the secret head of a large illegal gambling ring which use the computer for its operations.

他是一个秘密的，大的，非法的赌博团伙的头,那个团伙用这个电脑来操作。

哈佛公开课 - 计算机科学课程节选

But I bought last year for my girlfriend a very nice diamond ring.

但我去年给我女朋友买了一个很漂亮的钻石戒指。

强烈推荐购物 - SpeakingMax英语口语达人

It is possible to use the focus ring for focusing just like an SLR camera.

ENGADGET: Sigma DP3 Merrill packs a Foveon X3 sensor and a fixed F2.8, 75mm-equivalent lens

Hundreds of other Egyptians have tossed hats in the ring for presidential elections, due on May 23rd.

ECONOMIST: Egypt��s presidential race

Nelson, in the ring for his final attempt, threw the shot straight, but he stepped over the line.

NPR: Shot-Putter Nelson Fails To Make Olympic Grade