Definition: the hard outer covering of some creatures and of eggs, nuts, or seeds Level: B2
没有坚果钳，很难敲开巴西坚果的壳。
It's hard to crack the ___shell of a Brazil nut without a nutcracker.
我在森林小径上发现了一个小小的蜗牛壳。
I found a tiny snail ___shell on the forest path.
她从海滩带回的最喜欢的纪念品是一袋五彩斑斓的海贝壳。
Her favorite souvenir from the beach was a bag of colorful sea ___shells.
