In which的問題

有哪位高手可以告訴我,以下句子中 in which 的意思是什麼?

Simple systems are described by linear equations in which,for example,increasing a cause produces a proportional increase in an effect.
更新: 多謝你的答覆,可以順便幫我翻譯這個句子嗎?
2 個解答 2