在没有失稳之前，油封唇口接触宽度随油封内腔压力有明显增大，而最大接触压力先是不断增大，后由于接触宽度增大的缘故，最大接触压力开始减小。

Before the break, the width of the contact field on the air side has a great increase, but the max contact pressure increase at first and then become smaller due to the increase of the contact width.

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