shell
US /ʃel/
UK /ʃel/

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2.
贝壳, 甲壳
the hard protective outer case of a mollusk or crustacean
:
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We collected beautiful sea shells on the beach.
我们在海滩上收集了美丽的贝壳。
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The hermit crab lives in a borrowed shell.
寄居蟹住在借来的壳里。
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炮弹, 弹壳
an explosive projectile fired from a large gun or cannon
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The artillery fired a barrage of shells.
炮兵发射了一连串的炮弹。
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The building was hit by an enemy shell.
大楼被敌方炮弹击中。
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