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.

但污水中仍然充斥着危险的污染物，包括数十亿的和微生物、微量化学物质和过量的无营养物质，这些都可能污染河流和湖。

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.

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