The test group(n=228) with 2%NaF varnish was topical applied every 1 month for 3 months per annum.是什么意思_The test group(n=228) with 2%NaF varnish was topical applied every 1 month for 3 months per annum.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句