arch [ɑ:tʃ]

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n.拱门，桥洞；v.拱起，成为弓形

a structure consisting of a curved top on two supports , which holds the weight of something above it

Dip your head under the low arch. 在低矮的门拱下要低头。
The trees arch overhead. 树木在头顶上弯成拱形。