1、闡明，明確，界定。
It’s not difficult to define what makes it so popular.
不難解釋它為何如此走紅。
We need todefine the task ahead very clearly
我們必須明確今后的任務(wù)
2、給某詞下定義
The term ”mental illness” is difficult to define
“精神病“這個(gè)詞很難下定義。
Life imprisonment is defined imprisonment over 60 years.終身監(jiān)禁定義為60年以上的監(jiān)禁。
3、畫(huà)出……的線(xiàn)條，描出……外形，確定什么的界限。
The mountain was sharply defined against the sky.
那座山在天空的映襯下顯得輪廓分明。
