A pilot must remain vigilant at all times.

飞行员必须随时保持警惕。

《牛津词典》

Now the challenge is making sure the general population understands the new medicine is not a cure, so people remain vigilant against the disease, he adds.

目前的挑战是让一般人口能够认识到新的药物并不能治愈艾滋病，因此对艾滋病保持警惕，他补充道。

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However, a different explanation is necessary in cases where the vigilant behavior is not directed at predators.

然而，在警觉行为不针对捕食者的情况下，则需要不同的解释。

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Additional Home Secretary D.R.S.Chaudhary told a news conference Sunday authorities and citizens need to be vigilant, especially in five eastern states.

VOA: standard.2009.06.21

"Since aftershocks are continuing, we want our citizens to be vigilant a little longer, " Istanbul Governor Erol Cakir cautioned.

CNN: Aftershock raises fears as Turkey quake toll reaches 7,000

In the days to come, we will remain vigilant as a nation.

WHITEHOUSE: Weekly Address: America Stands with the City of Boston

They will have to remain vigilant for a while yet.

ECONOMIST: Paraguay