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，包括数十亿的病原体和生物、学物质和过的无机营养物质，这些都能污染河流和湖泊。

I headed to grad school to do a PhD, studying microbiology and microchemistry.

往研究生院攻读博士学位，研究生物学和学。

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.

们甚至以设计携带学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。