Opal,a high alkali active mineral,and crystal,a low alkali active mineral,are employed to experimentally study the source of expansion force of alkali-silica reaction(ASR).是什么意思_Opal,a high alkali active mineral,and crystal,a low alkali active mineral,are employed to experimentally study the source of expansion force of alkali-silica reaction(ASR).在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句