在kotlin里，在Class A里定义一个 关于Class B的扩展方法C，如何在A的外部调用这个C呢

Question

public open class Table<E : Entity<E>>(
    tableName: String,
    alias: String? = null,
    catalog: String? = null,
    schema: String? = null,
    entityClass: KClass<E>? = null
) : BaseTable<E>(tableName, alias, catalog, schema, entityClass) {
    
    public inline fun <C : Any> Column<C>.bindTo(selector: (E) -> C?): Column<C> {
        val properties = detectBindingProperties(selector)
        return doBindInternal(NestedBinding(properties))
    }
}

是先实例化A然后在对象A里实例化B在调用吗