How do you analyze what has gone wrong. You don't have any access to internals of the vending machine.

如果无法接触到它的内部构件，你将如何分析问题所在。

youdao

How do you analyze what has gone wrong. You don't have any access to internals of the vending machine.

如果无法接触到它的内部构件，你将如何分析问题所在。

youdao