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The foot surface is designed with mesh air holes to improve the heat dissipation and perspiration function during exercise and keep the foot dry.When the file module cache does not exist and is not a native module, Node.js parses the parameters passed in by the require method and loads the actual file from the file system. The wrapping and compilation details in the loading process were mentioned earlier as calling the load method. ?Qu Shuihua, 5G Network Engineer of China Mobile: The population density of the city is relatively high, the buildings in the city are relatively dense, and the whole wireless environment is relatively complex. The planning pilot projects of 2G, 3G and 4G have almost run out and the space is not large.Use the-j option to specify that the action corresponding to the current rule is ACCEPT.Reading study and research, especially the study of the notes of geniuses, celebrities and great men, found that the notes of geniuses are not a pile of dry words, but illustrated with pictures and texts.State mode refers to allowing an object to change its behavior when its internal state changes. The object seems to have modified its class. Divide this sentence into two parts by commas. The first part means to encapsulate the state into a separate class and delegate the request to the current state object. When the internal state of the object changes, different behavior changes will be brought about. The second part is from the customer's point of view, the object used has completely different behaviors in different states. The object seems to be instantiated from different classes, but in fact this is the effect of using delegates.