Definition: to add to something to make it larger or better Level: C2
他晚上在酒吧工作以补贴收入。
He ___supplements his income by working in a bar in the evenings.
他兼职是为了增加收入。
He was moonlighting to ___supplement his income.
公司通常用在线资源来补充面授培训。
Companies often ___supplement in-person training with online resources.
