问在Kotlin中，接口作为类的依赖关系是什么意思？

EN

interface SomeInterface {
    fun someFunction()
}

class SomeClass(private val someInterface: SomeInterface) {
    fun doSomething() = someInterface.someFunction()
}

class SomeImplementation(): SomeInterface {
    override fun someFunction() {
        println("did something")
    }
}

fun main() {
    val someClass = SomeClass(SomeImplementation())
    someClass.doSomething()
}