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The shell is smooth on the inside.
贝壳内壁光滑。
《牛津词典》
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The satellite is covered with a smooth shell of ice.
人造卫星上覆盖着一层平滑的冰壳。
youdao
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That is why the Tortoise's shell is not smooth.
这就是为什么陆龟的壳是粗糙的原因了。
youdao
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That is why the Tortoise's shell is not smooth.
这就是为什么陆龟的壳是粗糙的原因了。
youdao