on the trail of
紧跟踪迹追赶 hot on the trail
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猎犬嗅出了狐狸的气味，便开始跟踪追赶。
The hound picked up the fox's smell and started to chase after it.
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The hound picked up the fox 's smell and started to chase after it.
弗劳德小组正在跟踪追赶他，他正试图逃到国外去。
The Fraud Squad are hard on his track and he's trying to get out of the country.
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