beam compass的用法和樣例：
例句
- Use your compass to bisect an angle.
用圓規把一個角二等分。 - Trisecting an arbitrary angle with a compass and straightedge was one of the famous ancient Greeks unsolved construction problems.
用直尺和圓規三等分一個任意的角是古希臘著名的構造問題之一。 - Use your compass to bisect an angle.
用圓規把一個角二等分。 - Trisecting an arbitrary angle with a compass and straightedge was one of the famous ancient Greeks unsolved construction problems.
用直尺和圓規三等分一個任意的角是古希臘著名的構造問題之一。
