left-handedness
n. 左撇子
1. preference for using the left hand
Do children inherit left - handedness from their parents?
孩子會從父母身上遺傳左撇子 嗎 ?
Left - handedness is defined as any positive axis ( x , y , or z ) pointing away from the viewer.
而左手系就定義為任意軸的正向均背向觀察者.