学过化学的同学都知道,化学为工业提供各种原料和能源,为农业提供各种高质量的化肥和农药,为国防事业提供各种新式武器弹药, All the students who have studied chemistry know that chemistry provides various raw materials and energy for industry, provides various high-quality chemical fertilizers and pesticides for agriculture, and provides various kinds of new weapons and ammunition for national defense.