9. It is useful to kick the shuttlecock every day.
每天踢毽子對你有好處。
還能這樣說：
Daily kicking the shuttlecock does you good.
Kicking the shuttlecock every day will benefit you.
應(yīng)用解析：
make oneself useful 做些有用的事來幫忙；
例如：My nephews tried to make themselves useful about the house.
我的侄子都想幫我收拾房子。
10. Kicking the shuttlecock has sharpened my appetite.
踢毽子增進(jìn)了我的食欲。
還能這樣說：
Kicking the shuttlecock whets my appetite.
I eat more since I keep on kicking the shuttlecock.
諺語：
Appetite comes with eating.
胃口越吃越大（貪得無厭）。
11. There is nothing as sanative as kicking the shuttlecock.
踢毽子是最有效力的醫(yī)療方法。
還能這樣說：
Kicking the shuttlecock is the most useful way to keep healthy.
Kicking the shuttlecock is the most effective medical treatment.
應(yīng)用解析：
sanative 有療效的，有益健康的，治病救人的
12. I am not skilled in kicking shuttlecocks.
我不擅長踢毽子。
還能這樣說：
I can't kick shuttlecocks well.
I am not good at kicking shuttlecocks.
應(yīng)用解析：
show skill at doing sth. 顯示做某事的能力；
be skilled in doing sth. 熟練做某事