There, by day as well as by night, he is on the watch for his prey.

无论白天或黑夜，老虎都在那里等待猎食。

But from the earliest possible moment when it might arrive, William was on the watch for it.

但从邮件可能到达的最早时刻起，威廉就守望着它。

With Bill's warning in mind, Harry could not help suspecting that Griphook was on the watch for possible skullduggery.

有了比尔诚心的提醒，哈利不得不怀疑拉环在时刻监视着他们任何可能采取的诡计。

Be on the watch for anything suspicious.

【watch】注意任何可疑情况。

I don't know what, but I'm on the watch for it, and mean to astonish you all some day.

我不知道是什么，但我正在等待它，并打算有一天让你们大吃一惊。

When an army is encamped near a jungle, the men require to be on the watch, for sometimes a tiger springs out.

军队在丛林扎营时要派人放哨，因为有时会跳出老虎来。

They were on the watch for him, and would fly down from the green tree tops to greet him with their chirp.

它们站在枝头观察他，也会从枝繁叶茂的树上飞下来，用唧唧喳喳的啁啾声和他打招呼。

He said that the words on the spider's web proved that human beings must always be on the watch for the coming of wonders.

他说蜘蛛网上的字证明，人类必须时刻注意奇迹的降临。

But he sternly charged the police to be on the watch; for the swift right arm of the law should be in readiness to strike, as soon as they could prove a fault.

但他严厉地嘱​​咐警察要严阵以待；因为法律的右手应该随时准备出击，只要他们能证明是错误的。