It is fun picking up various shells on the beach.

在海滨捡各种贝壳是很有趣的。

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Meteorologists have divided the atmosphere into various shells or layers, laid one atop the other.

气象学家把大气分成不同的层，它们依次相叠。

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Different ratios in the shells preserved in various layers of sediment reveal the temperature changes in the oceans during the Pleistocene epoch.

不同沉积层中保存的壳有不同的含量比例，显示出更新代海洋温度的变化。

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Japanese technicians have been sent to Germany, Britain and America to study various ways of handling the shells.

ECONOMIST: Japan and China