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摘要：汉字的四声（平声、上声、仄声和去声） the four tones of Chinese characters, namely, the level tone, the rising tone, the falling-rising tone, and the falling tone   查看全文

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摘要：901. Manners are quite different from country to country.各国的礼仪各不相同。 902. Not only did I know her, but I was her best friend.我不仅认识她，还是她最好的朋友。   查看全文

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