n.直角;
例句:
He heated the iron rod and bent it into a right angle.
他将铁棒烧热,将其弯成直角.
An angle in a semicircle is a right angle.
半圆所对的圆周角是直角.
The upper arm joins the shoulder blade in an approximate right angle.
上臂以适当的直角与肩胛连接.