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Once you're in position, slightly tilt your head back and extend the tip of your tongue just past your bottom lip.
到达位置后,轻轻向后仰头,伸舌到稍微超过下唇。
youdao
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Once you're in position, slightly tilt your head back and extend the tip of your tongue just past your bottom lip.
到达位置后,轻轻向后仰头,伸舌到稍微超过下唇。
youdao