Without this reference assignment, there would be no way to assign a tests due date to the Machine object.

如果不分配这个引用，那么就无法将测试到期日期分配给Machine对象。

youdao

Without this reference assignment, there would be no way to assign a tests due date to the Machine object.

如果不分配这个引用，那么就无法将测试到期日期分配给Machine对象。

youdao