Semiarc
n. 半弧
🗣️ 情景例句
Two hours from now.
从现在起两小时。
May I have a receipt?
我可以要一张收据吗？
it has to develop (partly by means of touch) the ability to judge roughly three-dimensonal distances.
儿童必须发展（部分通过触觉）粗略判断三维空间距离的能力。