Bend degree is a basic unit to measure tonal arch degree.

折度是计量声调曲拱的基本单位。

youdao

So you want to take your shampoo, hold your arm straight up, keep your arm right next to your ear, and then simply bend your elbow to ninety degree, and then lift it back up.

你要拿起洗发水，手臂向上伸直，紧贴耳朵，然后只要将手肘向后弯曲90度，再将手肘伸直。

youdao

Extras for experts: Brace your hands against the back of a sofa and bend over at a 90-degree Angle.

专家支招：双手撑着沙发背，身体呈90度角弯曲。

youdao