美国英语音标外教发音详解视频：'ah' as in father 学习音标[a]
包含发音[a]的英语单词，mom, collar, bother, bottle
练习发音的简单句子：You can see my apartment from the top of the Rock when there's no fog.
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Free Meal 免费的午餐
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A Small Test 一个小测试
The Difficulty I Face 我遇到的困难
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