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一定要使你的舌头接触下齿的背面。
Make sure that your tongue touches the back of the lower teeth.
youdao
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在线板背面将天花与墙面接触的地方涂上万能胶。
Apply construction glue to contact points of cornice to wall and ceiling.
youdao
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在线板背面将天花与墙面接触的地方涂上万能胶。
Apply construction glue to contact points of cornice to wall and ceiling.
youdao