This formula is suitable for half an arch from arch bottom to vault.

公式的适用范围为拱底到拱顶的半个拱圈。

youdao

The test consists of placing the bottom of a foot in water, then stepping on a paper bag or some other object that will show how high or flat a person's arch is.

测试要先把脚底浸湿，然后踩在纸袋或其它可以显示你足弓高度的物体上。

youdao

It has a double arch, top and bottom. It's what makes an egg so incredibly strong.

它是双拱形的，上面下面都有。所以才使鸡蛋如此的坚固。

youdao

Joe Kinnear, confirmed as Newcastle manager until the end of the season 24 hours before kick-off, will be happy with a point that takes them out of the bottom three of the Premier League as arch-rivals Sunderland fall into the drop zone.

BBC: Middlesbrough 0-0 Newcastle