การแข่งขัน World Junior Championships ในปี 2010 มีกิจกรรมอะไรบ้าง?
What event was the competition World Junior Championships in 2010?
df = pd.DataFrame(columns=['event', 'competition', 'year'])
df.loc[(df['competition'] == 'world junior championships') & (df['year'] == '2010'), 'event']