But can an organism like a fruit fly, which is -- it's a great model organism because it's got a small brain, it's capable of complex and sophisticated behaviors, it breeds quickly, and it's cheap.
是极其困难的。 但是有机体如果蝇-- 就是很好的试验对象 因为它有一个小的大脑， 一个能完成复杂的行为的脑袋， 而且它培育起来很快，费用也不高。