A watchpoint will break program execution when the specified expression changes value, but it must be set when the variables used in the expression are in scope.
当指定表达式的值改变时，监视点将中断程序执行，但必须在表达式中所使用的变量在作用域中时设置监视点。
2
The Palo Alto Sunday family program USES music, art and discussion to encourage personal expression, intellectual curiosity and collaboration.
帕洛·阿尔托的周日家庭项目运用音乐、艺术和研讨的方式鼓励个人表达，求知欲和协同合作。
3
In Listing 2, the program will evaluate the expression four times, once for each tuple.