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。
It's a bird, it's a plane - no it's Mr Magic.
他是一只鸟,他是一架飞机,不!他是魔术先生。
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。
She is hoping to board a plane next Sunday. "If there are no flights, even until then, I will probably have to send my luggage by mail,and then try and get a train ticket going to Madrid and then maybe try and get back to Korea via New York or via Bangkok or Hong Kong.
VOA: standard.2010.04.19
So, it's the x-y plane, you can see there's no electron density anywhere there.
它在xy平面,你们可以看到在这里没有电子密度。
But if you go on a plane which is accelerating, you're no longer inertial.
但如果你上了一架加速飞行的飞机,你就不再处于惯性状态了
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