When multiple threads are accessing static data, your program must provide for possible resource conflicts.
当多线程访问静态数据时，程序必须提供可能的资源冲突。
Your program must find all sets of words in the dictionary which can be formed from the letters in each phrase.
对于每一个短语，字典中可能存在多个可以重组为该短语的单词集合，你的程序要把所有这些单词集合都找出来。
The classic example is a GUI where your program must respond when the user does something like press a key or move the mouse.
经典的例子便是GUI，程序必须响应用户的某些行为，比如按键或是鼠标移动。
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