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。
《柯林斯英汉双解大词典》
3
Even if all the tax they pay is VAT on expensive meals in London restaurants or stamp duty on flats in Mayfair, it is still additional income for Mr Brown.