使用ggplot中的facet_wrap将标题放在图表的顶部和左侧

df

DF

Date       Team    Country   Score
1/1/2012   TeamA   Germany  10
1/2/2012   TeamA   Germany  25
1/3/2012   TeamA   Germany  50
1/1/2012   TeamB   France  10
1/2/2012   TeamB   France  70
1/3/2012   TeamB   France  50
Date       Team    Country   Score
1/