be determined by
価格はコストと需要で決まる。
Prices are determined by costs and demand.
たいていの人の一生は環境で決まる。
For most people, the course of their lives is determined by their circumstances.
人の幸福は財産よりも人間性で決まる。
A person's happiness is determined more by their character than by their wealth.
勝負はこの一撃で決まる
This one strike will decide the match.
— 七人の侍 (1954)
単語の意味はそれが使われている文脈で決まる。
The meaning of a word is determined by the context in which it is used.