depend on/upon
1．rely on；rest upon 依靠；依赖
She depended entirely on her father．她完全靠她父亲。
His success depends chiefly on himself．他的成功主要靠他自己。
2．vary according to；be influenced or decided by 视…而定
Whether the game will be played depends on the weather．比赛是否举行要视天气而定。
The development of things depends fundamentally on internal causes．事物的发展基本上是由内因决定的。