我礼貌的点了点头，带着萍萍落在树屋前的平台上，稳步地向树屋内走去。

I politely nod and bring the Ping Ping to fall in front of the tree room in the platform, and walk with steady steps to the tree room.

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[1] 蒋娟萍，梁工谦，张树娟。 面向主动再制造的航空发动机涡轮叶片需求分析研究[J]。 航空制造技术， 2014， （1）：118-121。

JIANG J P, LIANG G Q, ZHANG S J. Research on requirement analysis of aeroengine turbine blade for active manufacturing[J]. Aeronautical Manufacturing Technology, 2014, (1):118-121.

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