So the way we develop drugs now is by testing promising compounds on -- We didn't have disease modeling with human cells, so we'd been testing them on cells of mice or other creatures or cells that we engineer, but they don't have the characteristics of the diseases that we're actually trying to cure.
因为，我们现在开发药物时， 测试有望成功的合成物时是使用⋯⋯ 我们以前没有使用人体细胞建模， 因此我们一直使用老鼠细胞进行测试， 或者使用其它生物细胞，或者是我们改造的细胞。 但是我们想要治愈的疾病 在这些细胞上未必会显现出来。