“拱形”用英语怎么说？

有拱形靠背的椅子a chair with an arched back葡萄藤在花园小路上方形成了拱形.Grape vines overarched the garden path.树木在头顶上弯成拱形.The trees arch overhead....

“拱形”的拼音为：gǒng xíng...