Prejudice just means " prejudgment." It's an unjustified, typically negative attitude toward an individual or group.

偏见只是意味着“偏见”。这是对个人或团体的一种不合理的、通常是消极的态度。

Like learning a trade, a profession, a hobby, learning how to swim, their doubts, prejudgments and hesitancy begin to melt away in the crucible of action.

就像学习一门手艺、一种职业、一种爱好、学习游泳一样，他们的疑虑、偏见和犹豫开始在行动的熔炉中消融。