As an additional safeguard against weeds you can always use an underlay of heavy duty polyethylene.

作为另外一种预防杂草的防护措施，你可以一直使用一层厚重耐磨的聚乙烯底垫。

The leaflet explains how to safeguard against dangers in the home.

小册子告诉人们在家里如何防备各种危险。

They safeguard against cancer.

他们能抗癌。

Safeguard against Settings change.

保卫对抗设定变化。

Keeping clean is a safeguard against disease.

保持清洁是抵御疾病的防护措施。