Objective To study the expression of osteoprotegerin(OPG)at messenger RNA(mRNA)level in human periodontal ligament cells(hPDLCs)under mechanical force loading in vitro.是什么意思_Objective To study the expression of osteoprotegerin(OPG)at messenger RNA(mRNA)level in human periodontal ligament cells(hPDLCs)under mechanical force loading in vitro.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句