单词：bismuth chromate
铬酸铋
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Black Tongues and Stomach Aches Don: Oh, no, Ya?l, I think I'm having a medical emergency. Quick! Call an ambulance. Ya?l: A medical emergency, Don? Are you sure? You look fine to me! D: But I'm not. This morning, I had a terrible stomach ache. And n
发表于:2019-01-26 / 阅读(142) / 评论(0)
英语听力文摘 English Digest
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经济学人综合
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