担任(工作等)；接受(任务等)；承担：
Who will undertake responsibility for this work?
谁将承担这项工作的责任?
此时undertake就相当于take，bear
.
负责；掌管：
I want you to undertake all the arrangements.
我希望你来负责全面安排工作。
此时undertake就相当于be in charge of
.
同意，答应；约定：
He undertook to finish the job by Wednesday.
他答应在星期三以前完成这项工作。
此时undertake to do相当于agree to do/consent to do sth.
2.
及物动词 If you undertake to do something, you promise that you will do it. 承诺
例：
He undertook to edit the text himself.
他承诺亲自编辑正文。
此时相当于promise to do sth.
承包 承担
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