| 单词 | keep watch on |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔spy〕One who secretly keeps watch on another or others.间谍：秘密监视别人的人美国传统〔watch〕The police arrived to keep watch on the mouth of the tunnel.警方赶来监控隧道口的情况。朗文当代 |
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