提供了很多新的函数和运算符在时间点和时期之间完成适当的算术运算。
Many new functions and operators are provided that allow all suitable arithmetic operations between points in time and durations.
而是指权衡所有的选项并在适当的时间冒一点可以估计的风险。
It means weighing all the options and taking calculated risks when appropriate.
因为可以直接获得任意时间点上的执行状态，如果用户点击了Back按钮，框架只需恢复适当的延续。
Because you literally have the execution state at any point in time, the framework can simply restore the appropriate continuation if the user ever hits the Back button.
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