gold·en rule
noun/ˌɡəʊldən ˈruːl/
/ˌɡəʊldən ˈruːl/
[usually singular]- an important principle that should be followed when doing something in order to be successful
成功之重要原则；指导原则 - The golden rule in tennis is to keep your eye on the ball.
打好网球的重要原则是眼睛要紧盯着球。
- The golden rule in tennis is to keep your eye on the ball.