ผู้เล่นคนไหนมีตำแหน่ง t1 และเล่นในสหรัฐอเมริกา?
Which player had a position of t1 and played in the united states?
df = pd.DataFrame(columns=['player', 'place', 'country'])
df[(df['place'] == 't1') & (df['country'] == 'united states')]['player']