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scroll wheel /ˈskɹəʊl ˈwiːl/ n

中文：滚轮

中文 · 滚轮Español · rueda de corrimientoFrançais · roulette de défilement
Meaning：Button used mainly to navigate through telephone menus and directories.
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Found in these illustrated scenes（2）

Portable cellular phone Mouse and input devices

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