But sewage is still rife with dangerous contaminants, including billions of pathogens and microorganisms, trace chemicals, and excess inorganic nutrients that can pollute rivers and lakes.

但水中仍然充斥着危险的染物，包括数十亿的病原体和微生物、微物质和过的无营养物质，这些都染河流和湖泊。

And we can even engineer antibodies that carry tiny doses of chemotherapy or radioactive particles, delivering these weapons directly to the cancer cells they're designed to recognize.

我们甚至以设计携带微疗法或放射性粒子的抗体，将这些武器直接输送到它们旨在识别的癌细胞中。