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。
A study this March of clamshells taken from Iceland found that the levels of oxygen isotopes in the shell layers varied depending on the temperature of the water in which they formed.
今年3月，通过对冰岛一带贝壳的研究发现，其硬壳氧同位素的水平会随水温的变化而产生差异。
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