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3. If sufficient water is available, diversion alone may be the most effective action to avoid an urgent situation, provided that such action is timely, substantial and does not create another urgent situation.郑菊花，你这个村妇。讲述受西方思想的夫妻，返回平安谷，想改变、建设家乡却遭遇重重困难，之后又牵扯幽灵新娘、绑架、凶杀等各种情节的故事。Http://www.jiemian.com/article/2145181.htmlThe export default command specifies the default output of the module. Obviously, a module can only have one default output, so the export default command can only be used once. Therefore, there is no need to enlarge parentheses after the import command, because only one method can be corresponding.//Declares a delegate variable and takes a known method as an argument to its constructorKnow the principle man: Very good, your experience value has improved a lot. However, we can't start fighting monsters yet. After all, no monster can be directly sprayed to death. You lack tools. Then at this stage, we need to strengthen our programming ability. First find a framework to come down, read the source code, what? You said you can't read the source code, it doesn't matter, there are a lot of experience reading the source code online. Of course, the basis of these experiences is without exception: read more and write more. On this basis, find trick again. After the source code of the framework is set down, change some codes to run, debug them, and then constantly find out the reason to see how each API is written, and try to write it yourself. Write more and practice more. After 30 years of hard coding, you will definitely get something.