渔夫有三种捕鱼策略：钓鱼、网捕、叉鱼
A fisherman could catch fish with three strategies : fishing with rod ,seine or spear.
铃声响了，老师听到了，走向教室；学生听到了，收起杂物准备上课
With bell ringing ，the teacher headed for classroom ,the students prepared for class.
有一个松木圣诞树，我们既可以装饰糖果，也可以装饰小灯泡
There is a pine Christmas tree, we could decorate it with candies ,thus making it a candy christmas tree ,or we could decorate with lights.
饿汉式占用资源；懒汉式用双检锁+volatile ，或者放在私有静态内部类的静态成员变量中。
Tree ways to achieve singleton ，eager way consumes resources in advance ; lazy ways use either volatile and double check locking ，or static inner class and store the instance in its static variable.
启动电视盒子，要先连接上专用电源，电源具备适配器的功能，接入插座，将插座的交流电转换为直流电。
A working tv box needed to plug in some certain type power device , the power device connecting to the pow outlet acts as an adapter ,transforming alternating current to direct current.