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可能落下来的爬行动物。

Amidst the crashing water and the steam and with a few minutes of respite before the day starts, the mind is no longer on guard.

一天开始之前，水和蒸气的冲击中得到几分钟的舒缓，心灵便不再处于戒备状态。

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.

虽然美国国部长马克·埃斯珀称巴格达迪之死ISIS是一个毁灭性的打击，但美国和其他国家表示，他还是会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.

官员告诉患有呼吸系统疾病的人要此保持警惕，他表示，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。

When you are on guard you must be careful and alert about something – it could be accuracy of what you see or hear, or just being aware of the dangers around you.

当你保持警惕的时候，你必须小心和警觉某事——它可能准确反映你看到或听到的东西，或者意识到你周围的危险。

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

售票员醒乘客谨小偷。

Teachers must stay on guard when it comes to what their students are doing in classrooms and how technology could be playing a negative role in the learning process.

教师必须保持警惕，了解生课堂上的一举一动以及科技如生习过程中起负面作用。

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，他小心翼翼，灯红酒绿的欢乐会有损体面。

Japan is still a country in recovery and still on guard.

日本仍然仍然是一个处于复苏及时刻需要保持警惕的国家。

33 Be on guard! Be alert! You do not know when that time will come.

33 你要谨慎、儆醒祈祷、因为你不晓得那日期几时来到。

While the Gestapo searched for leads, the White Rose were constantly on guard.

盖世太保搜寻线索的同时，“白玫瑰”一直处于戒备状态。

To " watch their back" means to be prepared or on guard.

“to watch their back” 意指时刻准备着或保持警惕。

George was on guard at the front gate last night.

乔治昨晚大门口守卫。

Like other animals, we are on guard until we know it is safe to relax.

跟动物一样，我会保持警觉直至知道安全的时候才放松。

The pack moves off, leaving the youngest member on guard.

狼群离开了，留下最年轻的站岗。

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

今天，北约国家俄罗斯的行动保持警惕。

So, penguin parents must always be on guard.

因此，企鹅父母必须时刻保持警惕。

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

印度东海岸的主要港口即将到来的风暴保持警惕。

One tree swallow was in the nest and the other on guard outside.

一只树燕子窝里，另一只外面站岗。

There is a soldier on guard all the time.

一直都有士兵站岗。