These are new and unrecognized diseases. Because we know so little about them, we get as much lab work done as we can afford.
These are new and unrecognized diseases. Because we know so little about them, we get as much lab work done as we can afford.
这些新病症尚未确诊.正是因为我们对它们知之甚少,所以我们必须进行大量的实验研究.