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- Tooth paste with fluorine can effectively guard against tooth decay. 含氟牙膏能有效防止 蛀牙.
- a guard against tooth decay. 防止虫牙的东西糖能蛀蚀牙。
- Brush your teeth regularly to guard against tooth decay. 经常刷牙,预防龋齿。
- They produce vaccine proteins for diseases like cholera, as well as antibodies against tooth decay and non-Hodgkin’s lymphoma. 它们生产蛋白质做成的疫苗来对抗霍乱之类的疾病，以及对抗龋齿和非何杰金氏淋巴瘤的抗体。
- Miners wore a helmet as a guard against falling rocks. 矿工头戴钢盔, 防护落下的岩石。
- Portuguese scientists said they had developed an experimental vaccine against tooth decay which was successful in laboratory tests on rats and could pave the way for a version that works for humans. 葡萄牙科学家说，他们研发出一种实验性疫苗能防止蛀牙，而它已在实验室的老鼠身上证实有效，这将有助开发防止人类龋齿的疫苗。
- A robe or smock worn in operating rooms and other parts of hospitals as a guard against contamination. 手术服在手术室里和医院的其他地方为防止感染或传染而穿的长袍或罩衫
- Vaccine against tooth decay successful in animal tests 龋齿疫苗通过动物测试
- 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。
- Dr Wilson says a lack of salivacauses tooth decay. 缺少唾液导致牙齿脱落。
- He urged them to guard against conceit. 他要求他们防止骄傲自满。
- He escaped by passing himself off as a guard. 他冒充警卫逃走了。
- He was a guard of gigantic strength. 他是个具有巨人般力气的卫士。
- Please guard against pickpockets on the bus. 在公共汽车上要谨防扒手。
- 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。
- Certain foods promote tooth decay. 有些食物会使牙齿腐烂。
- You must guard against catching a cold. 你必须小心以防感冒。
- We must guard against closet racists. 我们必须警惕隐蔽的种族主义者。
- Proper dental care can prevent tooth decay. 适当注意牙齿卫生可以防止龋齿。
- You must guard against catching a cold . 你必须小心以防感冒。
