Mantle material can sink at a plate boundary, and then flow back upward farther away, pushing on the crust - a process called small scale convection.

地幔，这种物质可以在板块边界处下沉，然后向上回流到较远的地方，再与地壳相碰撞——这个过程被称为小规模的对流。

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There is a boundary line over 4700 kilometers between China and its five South Asian neighbors and their exchanges can be traced back to more than 2000 years ago.

中国与5个南亚国家接壤，边界线长达4700多公里。中国同南亚国家的交往从2000多年前就开始了。

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Then, as I pass the boundary leading to Wallace Rockhole, an aboriginal settlement, a big blue sign by the road jolts me back to my journey’s purpose: “Warning.

然后，当我通过Wallace Rockhole的边境线时，一个很大的蓝色道路标颠簸我回到了我旅程的目的地：警告。

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He bowled Mark Boucher, had AB de Villiers caught by wicket-keeper Brendon McCullum sprinting back to the boundary, and Paul Harris then went slashing behind.

BBC: Super Steyn crushes hapless Kiwis

Some of the strokes were as good as ever, one exemplary punch off the back foot against Tremlett rocketing through mid-off to the boundary.

BBC: Maiden Kumble ton crushes England

Ramdin had hit one boundary before playing back to Muralitharan and being hit in front of off-stump - the fifth man in the innings to fall foul of the lbw rule.

BBC: Vaas celebrates the dismissal of Dwayne Smith on day three