球拍: racket...
顺其自然: to let nature take its course (idiom)...
皮肤: skin...
因人而异: varying from person to person (idiom); different for each individual...
小于: less than, <...
支出: to spend, to pay out, expense...
国产: domestically produced...
念念不忘: to keep in mind constantly (idiom)...
称心如意: after one's heart (idiom); gratifying and satisfactory, everything one could wish...
情调: sentiment, tone and mood, taste...
