In developed capitalist countries,the job of a good number of workers is just to stand and press buttons for hours on end. This is intense and concentrated mental labour as well as toilsome manual labour.

• 发达的资本主义国家有许多工人的工作就是按电钮，一站好几小时，这既是紧张的、聚精会神的脑力劳动，也是辛苦的体力劳动。