他说：“旋翼飞机在军事和商业上都发挥着关键的作用。
"Rotor craft specifically play a critical role for both military and commercial applications," he said.
两三周后我们会讲到空间上的旋度？
We are going to see curl in space in two or three weeks. Yes?
实际上，场的旋度是。
使用提供的专门钥匙打开上方盖板上的四个旋栓。
Use the provided key to open the four turning bolts (1) of the upper panel.
使用提供的专门钥匙打开上方盖板上的四个旋栓。
Use the provided key to open the four turning bolts (1) of the upper panel.
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