使用劣质原料会降低产品的质量。

Using inferior materials ___debases the quality of the product.

这些虚假广告降低了产品的信誉。

These fake ads ___debase the product's reputation.

政府偷偷地在金币中掺入铜来降低其价值。

The government secretly ___debased the gold coins by mixing in copper.