The conductor reminded passengers to keep on guard against the thief.

售票员提醒乘客谨防小偷。

And today, NATO countries are on guard against moves by Russia.

今天，北约国家对俄罗斯的行动保持警惕。

Major ports on India's east coast are on guard against an incoming storm.

印度东海岸的主要港口对即将到来的风暴保持警惕。

Cybersecurity specialists are also expected to be on guard against the hacking of computerized election systems in some states, including Colorado.

预计网络安全专家也将保持警惕，防范科罗拉多等州的计算机选举系统遭到黑客攻击。

But at the outset it seemed necessary to be on guard against the other two.

但一开始似乎有必要提防另外两人。

Millions of people in Africa are on guard against violence and threats of violence by extremists.

数以百万计的非洲人正在警惕极端分子的暴力和暴力威胁。

The animals can weigh up to 20 pounds so the Miami National Weather Service told people to be on guard against raining reptiles.

这些动物可能重达 20 磅，因此，迈阿密国家气象局要求人们提防可能落下来的爬行动物。

If you use all your available storage space and are constantly on guard against clutter, there's plenty of room.

如果您使用了所有可用的存储空间并经常防止杂乱无章，那么空间就足够了。

Experts say that's also possible, though world leaders are likely to be more on guard against ISIS in the future.

专家表示，这也是有可能的，尽管未来世界领导人可能会更加警惕伊斯兰国。

With the Lunar New Year set to begin on January 25, the WHO called on Thai officials and the public to be on guard against the virus.

随着农历新年将于1月25日开始，世卫组织呼吁泰国官员以及公众警惕这种病毒。

On guard against a second counterattack, Murphy refused to be evacuated to a field hospital, and remained with his men as his wounds were treated.

为了防止第二次反击， 墨菲拒绝被疏散到野战医院，并在治疗伤口时留在他的手下。

While U.S. Defense Secretary Mark Esper called al-Baghdadi's death a devastating blow to ISIS, America and other nations said they'd stay on guard against the next terrorist leaders who appear.

虽然美国国防部长马克·埃斯珀称巴格达迪之死对ISIS是一个毁灭性的打击，但美国和其他国家表示，他们还是会对下一个出现的恐怖组织头目保持警惕。

Officials are telling people with respiratory problems to be on guard against that, and they say La Soufriere could continue exploding for days or possibly weeks before it quiets back down again.

官员们告诉患有呼吸系统疾病的人要对此保持警惕，他们表示，La Soufriere火山可能会持续喷发几天甚至几周，然后才会恢复平静。

Instead of rambling this party had preserved a dignified homogeneity, and assumed to itself the function of representing the staid nobility of the countryside— East Egg condescending to West Egg, and carefully on guard against its spectroscopic gayety.

这伙人不到处转悠，而是正襟危坐，自成一体，并且俨然自封为庄重的农村贵族的代表——东卵人屈尊光临西卵，他们小心翼翼，提防灯红酒绿的欢乐会有损体面。

And he admits to that and now says that at this stage of his political career, he's trying really hard to be on guard against that instinct for rationalization 'cause he knows he has it in him.

他承认这一点，现在说，在他政治生涯的这个阶段，他非常努力地警惕这种合理化的本能，因为他知道他有这种本能。