N a dredging bucket that is hinged like the shell of a clam (蚌壳式)翻盖挖斗 [美国英语]
They fetched clamshells on the beach.
他们到海滩上去捡贝壳。
Excavation may be done by any of several excavators, such as shovels, draglines, clamshells, cranes, and scrapers.
土方发掘可用任何发掘机举行，如单斗发掘机、拉铲发掘机、蛤壳式挖泥机、起重机和铲运机等。
By analyzing clamshells unearthed on Canada's Melville Island, he can pinpoint individual summers in the region dating back 370 million years.
通过分析在加拿大梅尔维尔岛出土的蛤壳，他可以准确说出三亿七千万年来该地区某些夏季的天气情况。
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