A supplement, he points out, is something that either completes something that isn't complete or adds to something that already is complete.

他指出，一个补充物，或者是补充了不完整的事物,或者补充了已经完整的事物。

耶鲁公开课 - 文学理论导论课程节选

What you might do, for instance, is be sitting at a computer screen and you'll be given incomplete words to fill out "hos-" like "hos-" and you have to fill out this word.

例如，你可以，坐在一个电脑显示器前,你要补充一连串不完整的单词,例如补充完整。

耶鲁公开课 - 心理学导论课程节选