right angle

柯林斯词典

1. N-COUNT A right angle is an angle of ninety degrees. A square has four right angles. 直角
2. PHRASE If two things are at right angles, they are situated so that they form an angle of 90° where they touch each other. You can also say that one thing is at right angles to another. 成直角地
...two lasers at right angles. …两束成直角的激光。