牛劲

1. great strength; tremendous effort

♦ 他费了~才把门打开。 He had to exert all his strength to open the door.

2. stubbornness; obstinacy; tenacity

♦ 这小伙子有股子~, 干一件事就非干到底不行。 The lad is strong-willed; once he starts doing something, he won't leave off until he's finished it.