Is he making a model plane? No, he isn't. He is making a kite.

他正在做模型飞机吗？不，他不在。他正在做风筝。

youdao

Except that the selected sliding surface is formed by logarithmic helicoidal surface-logarithmic helicoidal surface-plane, no other simplifications or assumptions are made.

除选定滑动面为对数螺旋面—对数螺旋面—平面的形式外，没有其他任何的简化或假定。

youdao

Except that the selected sliding surface is formed by logarithmic helicoidal surface-logarithmic helicoidal surface-plane, no other simplifications or assumptions are made.

除选定滑动面为对数螺旋面—对数螺旋面—平面的形式外，没有其他任何的简化或假定。

youdao