The fourth argument is the recursion ID (if there is one), and the last argument is a handle returned by the function that we will need when it is time to de-register.
第四个参数是递归id(如果有的话)，最后一个参数是由取消注册时需要使用的函数返回的句柄。
This struct is used as an argument to allow methods to poll on it or register a callback to be fired when cancellation is requested. Cancellationtokensource.
这个结构体可作为一个参数，让方法进行轮询，或者注册到一个回调中，在撤销被请求的时候触发。
The observe method takes anything that can be passed to the :url option of a remote helper as its argument and creates the updateOrientation() method alluded to by the register helper.
observe方法将获取可以作为实参传递给远程助手的 :url选项的内容，并且创建由register 助手暗示的updateOrientation() 方法。
The register method call takes a class as an argument and makes the ABC a subclass of the registered class.
register方法调用接受一个类作为其参数并会让此abc成为所注册类的子类。
Whenever the protocol stack requires a value it calls one of the callback function with the register address and the number of registers to read as an argument.
当协议栈需要获取数值是，它通过调用回调函数来实现，该回调函数以寄存器地址和数量作为参数。
Whenever the protocol stack requires a value it calls one of the callback function with the register address and the number of registers to read as an argument.
当协议栈需要获取数值是，它通过调用回调函数来实现，该回调函数以寄存器地址和数量作为参数。
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