基本解释[機械工程]波前速度英汉例句雙語例句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.科學家發現，單個光子的前敺波頭一般以光速c傳播，就像由大量光子攜帶的信號的傳播速度一樣。velocity of wave front更多例句专业释义機械工程波前速度