Laborers were trained to handle 50-ton compactors and giant cranes.

工人们接受操作五十吨压土和巨型起训练。

The hardest work was assigned to the strongest laborers.

最繁工作分配给最强壮劳工。

A laborer takes a rest on a cinder dumpsite in Changzhi, China.

在中国长治，一工人在煤渣垃圾场酣睡。

Subject of labor is practice object subsystem, laborer is subsystem of practice main body, labor tool is practice neutretto system, productivity is the integral function that carries out a system.

劳对象实践客体子系统,劳实践主体子系统,劳工具实践中介子系统,生产力实践系统整体功能。