The compiler will after all very likely compile the above assignment into a single machine instruction.
编译器极有可能把上述赋值语句编译成一条机器指令。
First, you shouldn't assume that the above assignment would be compiled as a single machine instruction unless you personally verify the machine code yourself.
首先，不应该假定上述赋值语句一定会被编译成一条机器指令，除非亲自验证了机器代码。
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。
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