例如: Heat is constantly produced by the muscular andcellular activity of the body. 由于肌肉和细胞的活动,身体不断产生热量。 Masses of oxygen is produced in air by green plant’sphotosynthesis to keep the living beings alive. 由于植物的光合作用,空气中产生大量可供生物生存的氧气。 不过这种情况需要译者仔细分析英语原句,判定施动者和受动者之间是否的确存在因果关系。