... safety precaution 安全措施 sanitary precaution 卫生预防 by way of precaution 为小心起见 ...
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His cunning began here; he smiled habitually, by way of precaution, and was almost polite to everybody, even to the beggar to whom he refused half a farthing.
他为了防备他人而脸上经常带笑，几乎对所有的人，即使对一个向他讨一文钱而不得的乞丐，也都客客气气。
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