safeguard

1. V-T To safeguard something or someone means to protect them from being harmed, lost, or badly treated. 保護; 保衛[正式]

They will press for international action to safeguard the ozone layer. 他們將竭力要求國際行動來保護臭氧層。

2. N-COUNT A safeguard is a law, rule, or measure intended to prevent someone or something from being harmed. 安全條例; 防護措施

As an additional safeguard against weeds you can always use an underlay of heavy duty polyethylene. 作爲另外一種預防襍草的防護措施，你可以一直使用一層厚重耐磨的聚乙烯底墊。