我警觉起来，因为，当然了，潜伏着另一个威胁：我独自去纽约。
I tensed at once, for there, of course, lay another danger: my own visit to New York.
我们离机场不远，我想可能是架低空飞行的飞机，所以我警觉起来。
We're not far from the airport so I thought it could even have been a low-flying plane, so I was quite alarmed.
鹿群突然竖起的尾巴让我也警觉了起来：可能有猛虎！
It was the deer's suddenly raised tails that tipped me off: tiger time.
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