Busy taking out the trash, the mantis shrimp keeps a sharp lookout.

忙着倒垃圾的螳螂虾保持着敏锐的观察力。

That was enough. I determined then and there to keep a sharp lookout.

这就足够了。我当场就打定主意要格外留意这件事。

So let's continue our excursion, I went on, but keep a sharp lookout.

那么，我们继续走吧，我说，不过眼睛要留神，要四处张望。

They follow, equipped in this fashion, in rear of the slaves, keeping a sharp lookout upon them all.

他们以这种方式跟在奴隶身后，密切注视着他们所有人。

Every few yards it stopped to rest. Colin leaned on Dickon's arm and privately Ben Weatherstaff kept a sharp lookout, but now and then Colin took his hand from its support and walked a few steps alone.

每隔几码它就会停下来休息。科林靠在迪肯的胳膊上，季元本私下里密切注视着，但科林时不时把他的手从扶手上拿开，独自走几步。