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flatten
英/flˈætən/
美/ˈfɫætən/
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01v.
使...不活跃, 变平
make flat or flatter; become flat or flatter; lower the pitch of (musical notes)
02v.
弄平, 打倒, 使失去光泽
make flat or flatter; become flat or flatter; lower the pitch of (musical notes)