A randomized multicentre clinical comparative study of the stainless steel ring, VCu 200 and TCu 220c has been carried out in 23 centres in 13 provinces and municipalities.是什么意思_A randomized multicentre clinical comparative study of the stainless steel ring, VCu 200 and TCu 220c has been carried out in 23 centres in 13 provinces and municipalities.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句