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

人们接受十吨压土机和巨型起重机的训练。

The hardest work was assigned to the strongest laborers.

最繁重的分配给最强壮的劳。

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

在中国长治，一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.

劳动对象实践客体子系统,劳动者实践主体子系统,劳动实践中介子系统,生产力实践系统的整体功能。