Note that when the second thread enters the synchronized block, it does not check to see if instance is non-null.
注意：当第二个线程进入synchronized块时，它并没有检查instance是否非null。
It was found that the code length distribution was closely correlated with the shift symmetry properties of synchronized coding and was characterized by sequencing and non-integral power of 2.
研究发现：其码长分布与同步字的移位对称数密切相关，具有连续和非2的整数次幂等特点；
Memory card operations within the mobile device are synchronized to the non-receiving periods.
移动设备内的存储器卡操作与非接收周期同步。
If a method only operates on independently synchronized objects, local variables, or non-volatile data members, such as those initialized during construction, then synchronization is not required.
若方法只操作专属的对象、本地变量或无冲突的数据成员(如只在构造时期初始化的数据)，那么同步就是不需要的。
Where the duplicated system can't be synchronized, the non-duplicated (responding) system can also synchronize or accelerate the synchronization of the chaotic system.
并且当复制系统不能同步时，用非复制响应系统同样可以实现混沌同步，或者加速实现混沌系统的同步化。
Where the duplicated system can't be synchronized, the non-duplicated (responding) system can also synchronize or accelerate the synchronization of the chaotic system.
并且当复制系统不能同步时，用非复制响应系统同样可以实现混沌同步，或者加速实现混沌系统的同步化。
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