可以省略

• When there are no actual arguments then the parentheses can be omitted
  在没有实际参数时，可以省略括号。
• When we give an instruction , we can leave out the subject
  当我们给出指示(叫别人做事)时,我们可以省略主语
• However , you can omit the commas
  ，可以省略逗号。
• You can also omit the type argument and the compiler will infer it
  也可以省略类型参数，编译器将推断出该参数。
• Rule : when we give an instruction , we can leave out the ( subject )
  规则:当我们给一个说明或指示,我们可以省略掉主语
• Specifies that a procedure argument can be omitted when the procedure is called
  指定在调用过程时可以省略过程参数。
• Statement can be omitted
  类型，则可以省略
• You can then omit the
  随后，您可以省略
• You can omit the parentheses only if you are not supplying any arguments
  过程。只有在不提供任何参数时，才可以省略括号。
• Using statement allows you to omit the library name , and refer to the component type as
  语句可以省略库名，并将组件类型作为