According to the strata about the trace elements in coal of China,the different background value of trace elements in different parts of China were d rew out.是什么意思_According to the strata about the trace elements in coal of China,the different background value of trace elements in different parts of China were d rew out.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句