共同点倒是有的。
All of these scenarios share a common thread.
所有这些场景都具有下列共同点。
The common thread is that they did not become defeatist or depressed.
他们的共同思路是他们都没有被打败，或者从此变得消沉的。
One common use is for storing a singleton of a type that is not thread-safe.
一种常见用法是用于存储非线程安全类型的单例。
One common use is for storing a singleton of a type that is not thread-safe.
一种常见用法是用于存储非线程安全类型的单例。
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