The principle and techniques of positron annihilation including positron annihilation lifetime spectroscopy and coincidence Doppler broadening are introduced in this article.是什么意思_The principle and techniques of positron annihilation including positron annihilation lifetime spectroscopy and coincidence Doppler broadening are introduced in this article.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句