prevent的用法例句

　　1. A dentist may decide to extract the tooth to prevent recurrent trouble.

　　牙醫可能會(huì )決定拔掉那顆牙，以免反復發(fā)作。

　　2. The security zone was set up to prevent guerrilla infiltrations.

　　設立了安全區以防止游擊隊員的滲入。

　　3. Smear Vaseline on to your baby's skin to prevent soreness.

　　給孩子皮膚上抹些凡士林以防止腫痛。