二十多年前科学家就已经知道癌症是一种基因病变。
Scientists have known for more than two decades that cancer is a disease of the genes.
此前科学家们正在研究一种特殊的海洋细菌，它能产生分解包寿司的紫菜的酶。
The scientists were studying a particular Marine bacterium, which makes enzymes that break down the kind of seaweed used to wrap sushi.
他指出，目前科学家开始研究一种叫邻苯二甲酸盐的化合物，该化合物广泛用于工业生产，起到增塑剂的作用，一些儿童玩具及医药用品中也含邻苯二甲酸盐。
Dr. Landrigan said scientists start concerned about chemicals called phthalates, widely used to make plastic flexible, and found in baby toys and medical supplies.
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