Definition: to be a curved shape or make something become a curved shape Level: C2
桥拱形跨越河流。
The bridge ___arched over the river.
突然一道闪电呈拱形划过天空，随后传来隆隆的回响。
Suddenly a flash ___arched across the sky, followed by an echoing rumble.
夏日暴雨过后，彩虹拱形跨越地平线。
Rainbows ___arch over the horizon after a summer storm.
