例句
Since there is only one singleton instance, any instance fields of a singleton will occur only once per class, just like static fields.
由于只有一个单实例，单例对象的域只会在一个类中出现一次，就像静态域一样。
Since there is only one singleton instance, any instance fields of a singleton will occur only once per class, just like static fields.
由于只有一个单实例，单例对象的域只会在一个类中出现一次，就像静态域一样。