戴口罩可以有效防止病毒传播。

Wearing masks helps in ___preventing the spread of viruses.

锁好门窗可以有效防止入室盗窃。

Locking doors and windows is effective in ___preventing burglaries.

定期洗手是防止疾病传播的重要方法。

Washing hands regularly is crucial for ___preventing the spread of diseases.