undergoes , undergoing , underwent , undergone
If you undergo something necessary or unpleasant, it happens to you.
New recruits have been undergoing training in recent weeks.
新兵们最近几周一直在接受训练。
When cement powder is mixed with water it undergoes a chemical change and sets hard.
水泥粉和水混合会发生化学变化,凝固变硬。