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。
As an additional safeguard against weeds you can always use an underlay of heavy duty polyethylene.
所有年龄层的消费者都想要增强他们的认知能力、预防年龄引起的衰退。
Consumers of all ages want to boost their cognitive abilities and prevent age-related decline.
全球计划的目的是要把警戒和预防措施扩大到所有疟疾流行国家，从而增加又一层保护。
What the global plan aims to do is add another safeguard by extending vigilance and preventive measures to all endemic countries.
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