With reference to your letter of the 6th inst., we are glad to inform you that there has been a great demand for the articles.
关于本月6日的来信，我高兴地告知，该商品的需求量甚大。
Thread 1 then begins to execute the code at //4, making inst non-null but before the constructor for Singleton executes.
线程 1 然后开始执行 //4 处的代码，同时使 inst 为非 null，但在 Singleton 的构造函数执行前。
Another idea is to use the keyword volatile for the variables inst and instance.
另一个想法是针对变量inst以及instance使用关键字volatile。
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