门铃响了，正好给了Michael一个必需的休息间隙，他打开了门，是个送比萨饼的女孩。

The doorbell rings, giving Michael a much needed break from the project. He opens the door for a delivery girl.

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因此，准确测量发动机的篦齿间隙在航空发动机研发、改进、制造以及维护的过程中是十分必要也是必需的。

Therefore, the accurate measurement of the labyrinth gap of aeroengine is very necessary and required in the process of research, improvement, maintenance and manufacturing.

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所以，在航空发动机研发、改进、制造以及维护的过程中，准确测量发动机篦齿间隙是十分必要也是必需的。

So it is necessary to accurately measure the clearance of labyrinth in the process of devising, ameliorating, producing and maintaining engines.

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