Donors were screened to make sure that they were group o.
献血者被筛选以确保他们是O型血。
At eleven o 'clock a group of children came over the hill.
11点钟的时候，一群孩子翻山过来了。
Most US donors are Caucasian, amongst whom 45% of people are blood group o.
大多数美国供血者是高加索人，其中的45%是O型血。
We're expecting an overseas tour group at five o 'clock.
我们预期五点的时候会有一队海外来的旅行团。
We're expecting an overseas tour group at five o 'clock.
我们预期五点的时候会有一队海外来的旅行团。
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