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。
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。
Take letters from a warning friendly power authorizing privateering.
私掠许可证：从某一个国家获得合法抢劫的证书。
Take letters from a warning friendly power authorizing privateering.
私掠许可证：从某一个国家获得合法抢劫的证书。
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