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Traditional CARDS and letters are not environment-friendly as they are made of paper.
传统的贺卡和书信不是环境友好型的，因为它们是纸质的。
youdao
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The tone of his letters has sharpened (ie become less friendly) recently.
他最近来信的口气变得刻薄起来。
youdao
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The tone of his letters has sharpened (ie become less friendly) recently.
他最近来信的口气变得刻薄起来。
youdao