Warning: file_put_contents(/www/wwwroot/ppbbu/80125.cn/cache/1eee745a80f39665fec3dbe0651f1395.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/80125.cn/index.php on line 58 velocity of wave front是什么意思，velocity of wave front的翻译，velocity of wave front音标、读音、用法和例句_食材铺反向词典
The scientists found that the precursor wave front of a single photon always travels at c, like the signal velocity of large groups of photons. 科学家发现，单个光子的前驱波头一般以光速c传播，就像由大量光子携带的信号的传播速度一样。