Neither the miner nor the logger can be dispensed with, any more than can the chemist at the factory or the worker in the oil field -- paraffin being a by-product of petroleum.
伐木工人和矿工都不能省略，至多却不比工厂里的化学家和油田里的工人更重要——石蜡是石油的副产品。
2
A worker ploughs a field in front of the Kendal Power Station, a coal-fired power station in Witbank, in South Africa's Mpumalanga province.
南非—Mpumalanga 省： 在一座位于Witbank的火电站前，一名工人正在田间耕作。
3
Several years of experience in the health field as a health care professional or as a community or social service worker are usually required.