形成

form; take shape; constitute; develop; forge; generate; draw; grow up; channel; germinate; determine; pattern; evolve; come into being; crystallize; emerge; formation; growth; constitution; development; generation; gestation; production; developmental

钳形

pincershaped; clamplike

包围

surround; encircle; besiege; enclose; encompass; envelop; hem in