3.Laborers were trained to handle 50-ton compactors and giant cranes.
们接受操作五十吨压土机和巨型起重机的训练。
4.A laborer takes a rest on a cinder dumpsite in Changzhi, China.
在中国长治,一名在煤渣垃圾场酣睡。
5.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.