noun [专属名词] 拱门；拱顶；足弓；拱形物
An arch is a curved line or movement. 弧线; 弧线运动
verb [vt. 及物动词] （使）成弓形，拱起
If you arch a part of your body such as your back or if it arches, you bend it so that it forms a curve. 弓着
adjective [原级] 淘气的，调皮的；傲慢自大的；主要的
knowing or superior 知识渊博的; 优越的
