经济学人下载:污水的社会经济学(2)

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I suppose I was looking for an occupation which was going to be an adventure.
我想我在找的是一份具有冒险性的工作。

2.keep track of 记录；掌握

Police keep track of the kidnapper using electronic surveillance equipment.
警方利用电子监视设备跟踪绑架者。