prevent的用法例句

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

　　牙醫(yī)可能會決定拔掉那顆牙，以免反復(fù)發(fā)作。

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

　　設(shè)立了安全區(qū)以防止游擊隊(duì)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。