For instance, when hurricane Bebe hit Tuvalu in 1972 it deposited 140 hectares of sedimentary debris onto the eastern reef, increasing the area of the main island by 10 per cent.

举例来说，1972年袭击了图瓦卢的飓风比比在东部礁岩上沉淀了140公顷的沉积碎屑，将主岛的面积扩大了10%。

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For example, with the wind at an intensity that a sloop might have to double-reef the main to reduce sail area, a ketch may sail very well under just jib and mizzen.

例如，当风速在某个强度上时，单桅帆可能必须将主帆四叠起来以减少帆面积，而双桅帆则可以只用前帆和后帆来顺利航行。

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The Main Chromitite Seam and the Merensky Reef do not outcrop well.

主铬铁岩矿层及麦仑斯基矿层出露不好。

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This creates the main structure of the coral reef.

VOA: special.2010.08.10

The project looks at four main threats to coral reefs -- marine-based threats, over-fishing, coastal development, and land-based sources of pollution -- in six main coral reef regions.

CNN: Could online maps save coral reefs?

"The main reason is to record reef environments on an unprecedented scale and reveal them to the world, " explained Richard Vevers, the project's director.

BBC: Google adds coral reef panoramas to Street View maps