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

我前往研究生博士学位，研究微生学微量化学。

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，包括数十亿的病原体微生、微量化学质过量的无机营养质，这些都可能污染湖泊。

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.

我们甚至可以设计携带微量化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。