He was standing in the centre of a group of boys, and he was telling a joke.

他站在中心的一群男孩，他在讲笑话。

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The photograph shows the whole family, his grandparents standing proudly at the centre of a group of four children in front of a house on a busy street.

照片显示全家，他的骄傲地站立在一个小组的中心的祖父母在一个房子前面的四个孩子一条拥挤的街的。

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A separate group of 158 refugees were deported from a detention centre on the border.

有着158名难民的一单独小队已从位于边界上的拘留中心被驱逐出境。

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If predators are able to operate only in the same number of dimensions as their prey as is the case for lions and zebra, or barracuda and schooling fish then individuals at the centre of a group really should be safer than those at the edges.

ECONOMIST: Animal behaviour

During operations, Nimitz-class carriers sail at the centre of a carrier battle group of ships that includes guided missile cruisers, destroyers, frigates, logistics ships and submarines.

BBC: News | In Depth | Military Fact Files

The opening of the new centre on Monday will see a group of local children swimming the equivalent length of the English Channel to raise money for charity.

BBC: De Montfort University's jubilee leisure centre opens