免费专业英语词汇下载 ... 岩溶地形 karst topography 《定期维修斜坡》 Keep Your Slope Safe 路缘；路边石；路缘石 kerb ...
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keep watch in secret
秘密监视
以上为机器翻译结果，长、整句建议使用 人工翻译 。
It is claimed he was a German secret agent brought to America in the early 90s to keep watch on the American far right.
BBC: Q&A: What really happened
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