"take it upon" in Chinese (Simplified)
主动承担自告奋勇
Definition
在没有被要求的情况下主动承担重要或有责任的事情；自愿负责某件事。
Usage Notes (Chinese (Simplified))
常用于正式和非正式场合，常跟“myself/himself”等。强调主动性和个人担当，表示主动去做本可以不做的、有责任的事。
Examples
He took it upon himself to clean the kitchen.
他**主动承担**了打扫厨房的任务。
She takes it upon herself to help new students.
她**主动承担**帮助新生的任务。
I took it upon myself to call everyone about the party.
我**主动承担**了通知大家聚会的任务。
Nobody asked, but I took it upon myself to organize the reports.
没人要求，但我**主动承担**了整理报告的任务。
Why did you take it upon yourself to fix the computer?
你为什么**主动承担**修电脑的事？
He just takes it upon himself to make sure everything runs smoothly.
他总是**主动承担**让一切顺利进行的职责。