If you interpolate a comment into a conversation or some words into a piece of writing, you put it in as an addition.
例句
Williams interpolated much spurious matter...威廉斯插入了許多偽造的素材。These odd assertions were interpolated into the manuscript some time after 1400.這些奇怪的論斷是于1400年后的某個時間被加入手稿的。
英漢詞典釋義
v.
插入,插(話)
Many lines have been interpolated into the manuscript at a later date.不少字句是后來添寫進原手稿中去的。
篡改
interpolate improperly不恰當地竄改
英英詞典釋義
Verb
1. estimate the value of
2. insert words into texts, often falsifying it thereby