translation.en: They really didn't know what to do, until along came a German scientist who realized that they were using two words for forelimb and hind limb, whereas genetics does not differentiate and neither does German.
translation.zh: 他们有点束手无策， 直到一个德国科学家参与后 他发现他们在研究前肢和后肢时 用的是两个词， 而遗传学上并不区分两者 德语也不区分。