1、It all seems to parallel ideas about left-handedness in human cultures.
人類文明在對待左撇子的觀念上似乎全是對等的。

2、What mechanisms control handedness and keep left-handedness rare?
是什么機制控制了用右手或左手的習(xí)慣并使左撇子很少出現(xiàn)？

3、Left-handedness has sometimes been treated as pathological.
左撇子有時被看做是病態(tài)的表現(xiàn)。