คำแนะนำของผู้เขียน
To produce a clear / v/ sound the upper teeth lightly touch the lower lip To produce a clear / v/ sound the upper teeth lightly touch the lower lip
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คำแนะนำของผู้เขียน
To produce a clear / v/ sound the upper teeth lightly touch the lower lip To produce a clear / v/ sound the upper teeth lightly touch the lower lip