- experience or be subjected to (something, typically something unpleasant or arduous)
verb: undergo, 3rd person present: undergoes, gerund or present participle: undergoing, past tense: underwent, past participle: undergone
- experience or be subjected to (something, typically something unpleasant, painful, or arduous): the baby underwent a life-saving brain operation
Oxford American Dictionary
Airport and school employees undergo extensive screenings.機場和學校的員工需進行廣泛的審查。 說明: 對於應徵要擔任機場和學校的員工, 基於安全的理由, 所以對應徵者的身家背景必須做廣泛性的調查
...largely determined (可能動詞一) by the amount of stretching each block undergoes (可能動詞二) as dictated (分詞) by the packing frustrations...
You can say "undergo a surgery" or "undergo an operation" 而第三人稱就是 undergoes an operation