VERB
经历；接受；遭受；忍受
If you undergo something necessary or unpleasant, it happens to you.
例句
New recruits have been undergoing training in recent weeks...
最近几周，新兵正在接受训练。
He underwent an agonising 48-hour wait for the results of tests.
他苦苦等待了48个小时，化验结果才出来。