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- The citizens were warned to be on guard against a sudden night attack. 市民们得到通知，要提防夜间的突然袭击。
- guard against a flood 防洪
- He put me on my guard against a large number of beliefs to which I had no temptation. 他要我提防许许多多我本来就不会受诱惑的信条。
- Borrowers were yesterday warned to be on their guard against a sudden surge in interest rates. 借款人要留意利率可能急升。
- The company has had a good year but we must guard against complacency. 公司获得了一个好年头，我们务必防止沾沾自喜。
- A flood of this sort is really unprecedented. 这样大的洪水真是十年九不遇。
- Researching new vaccines to guard against a potential bioterror attack is only a small part of the scientific scope of the NIH. 事实上，研发新疫苗来防范生物恐怖攻击，仅??IH研究计画的一小部份。
- A flood of cheap imports has come into the shops. 大量廉价进口商品涌入商店。
- LONDON (Reuters) - Doctors should not routinely give aspirin to people with diabetes to help guard against a heart attack or stroke, a British study found on Friday. 伦敦（路透社）-本周五，英国一项研究表明，医生不应当按惯例给糖尿病人服用阿司匹林以预防心脏病或者中风。
- He urged them to guard against conceit. 他要求他们防止骄傲自满。
- There's a flood in the next valley. 旁边的山谷被水淹了。
- Guard against a hidden arrow. 谨防暗箭。
- I received a flood of letters this morning. 我今天早晨收到一大批来信。
- Please guard against pickpockets on the bus. 在公共汽车上要谨防扒手。
- The ship beat back against a monsoon. 船逆着季风艰难地行驶。
- The car dashed against a telephone booth. 那车子猛地撞在一间电话亭上。
- We must guard against closet racists. 我们必须警惕隐蔽的种族主义者。
- I ran up against a glass door and hurt my head. 我撞到一扇玻璃门上，把头撞伤了。
- He ran against a lamp post in the dark. 在黑暗中他撞上了一根电线杆。
- You must guard against catching a cold. 你必须小心以防感冒。
