it must be light
网络释义
2.First , it must be light , the lighter the better , because it has to be sent up into space by a rocket .
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双语例句原声例句权威例句
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First, it must be light, the lighter the better…
首先它必须很轻，越轻越好……
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The light source must therefore be immensely brighter if it is to be used as a headlight to illuminate the path, than if it is to be used as a signal to others.
与用作被人识别的信号相比，如果用作照亮路途的头灯的话，光源必须要明亮很多。
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The sky must be very dark for a moonbow to be watched clearly—any bright light can obscure it.
要想清楚地观察到月虹，天空必须非常黑暗——任何明亮的光线都可能使它模糊。
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And what de Broglie said is well, if it's true that light, which has a wavelength can have momentum, then it must also be true that matter, which has momentum, also has a wavelength.
德布罗意说的是，如果光具有波长和动量是对的,那么物质具有动量和波长,也一定是对的。
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