It has to be tiny enough to get through the bloodstream, it's got to be small enough to penetrate the tumor tissue, and it's got to be tiny enough to be taken up inside the cancer cell. To do this job well, it has to be about one one-hundredth the size of a human hair.
Оно должно быть крошечным, чтобы пройти по сосудам, проникнуть в опухоль и внутрь раковой клетки.