名词
中文翻译：壳
同义词：
['shell', 'beak', 'mouthpiece', 'rostrum']
例句：
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1. The turtle has a long shell to protect itself from predators.
乌龟有长长的壳来保护自己免受捕食者的伤害。
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2. The bird's beak is sharp enough to tear through the toughest leaves.
鸟的喙足够锋利，可以撕裂最坚韧的叶子。
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3. The musician uses a mouthpiece to control his voice during performance.
音乐家使用一个口风琴来控制他的声音，以便于表演。