Ignore the fact that catch usually means exceptions which usually means some kind of failure. A piece of code is running and it just started some work that’s going to take a long time in the background, there’s no point waiting and the program can do something more useful while the stuff happens in the background. It “throws” an exception that is caught by a scheduler multiple layers of function calls up the stack. The scheduler saves the return address into a list of pending work to get back to, and then goes to find something that it can make progress on. Eventually it completes the other work and is signalled that our background task is complete. It pops the return address off the list and jumps to it, continuing the function call exactly where it left off as though nothing happened.
以色列军方承认，开始有选择地拦截威胁最大的目标，换句话说，就是对部分非核心地区已经放弃拦截。已有学者评估，按目前的伊朗还击力度，以军反导系统备弹能坚持到开战14天，而美军能坚持到20天。
。业内人士推荐clash下载作为进阶阅读
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