arch

Looking from a distance like a gigantic arch, it is a continuous loop, a kind of square doughnut.

从远处看像一座巨大的拱门，实际上它是一个连续的环，有点像方形面包圈。

It seemed to take Sirius an age to fall: his body curved in a graceful arc as he sank backwards through the ragged veil hanging from the arch.

好像小天狼星摔倒用了很长时间；当他向后摔倒，通过了拱门上粗糙的帘子时，他的身体蜷成了一个优美的拱形。