Preschoolers on methylphenidate, or generic Ritalin, grew about a half-inch and gained about 2 pounds less than expected during the 70-week study.是什么意思_Preschoolers on methylphenidate, or generic Ritalin, grew about a half-inch and gained about 2 pounds less than expected during the 70-week study.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句