00:00。
00:20。
00:22。
00:28So, this is a very important part of the study.
00:30The second part of the study is a very important part of the study.
00:37You can see the study is very thin.
00:39The study is very thin.
00:41In the future, we hope that the structure will be lighter and lighter.
00:46The aircraft will be lighter and better.
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