OK, so if I make a 100-nanometer cancer detector, I inject it in the bloodstream, it can leak into the tumor where it's activated by tumor enzymes to release a small signal that is small enough to be filtered out of the kidney and put into the urine, I have a signal in the outside world that I can detect.
好，那如果我制造一个 100纳米的癌症检测装置， 注射到血流中， 它可以渗漏到肿瘤 并被肿瘤的酶激发， 释放出很小的信号， 小到可以被肾脏过滤出来 并进入尿液中。 我就有了一个可以在体外探测到的信号。