Up to now, Most large synthetic diamond crystals are grown by temperature gradient method (TGM) under high pressure and high temperature (HPHT) developed by G.是什么意思_Up to now, Most large synthetic diamond crystals are grown by temperature gradient method (TGM) under high pressure and high temperature (HPHT) developed by G.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句