When ready for the debut in the Unite States the original title of "fist of fury" was too close to "fists of fury" the American release title earlier.

准备在美国上映前，电影原英文名《愤怒拳头》和之前的《愤怒的拳头》太过相近。

youdao

The boy had some slight difficulty in undoing the heavy iron gates, and we heard the hoarse roar of the doctor's voice and saw the fury with which he shook his clinched fists at him.

那小伙子打开笨重的铁门的时候有点困难，我们听到医生嘶哑的嚎叫声，看到他地向小伙子摇着攥紧的拳头。

youdao

" His role as Kato in the 1966 TV series "The Green Hornet" led to American success for his Hong Kong-made fight films, beginning with "Fists of Fury.

WSJ: Hollywood's New Kick: Why Everybody Is Kung Fu Fighting

In the four films he made - Fists of Fury (1972), Enter the Dragon, The Chinese Connection and Return of the Dragon (all 1973) - Lee became an overnight sensation.

BBC: Bruce Lee: The kung-fu legend