您要查找的是不是：
- Mary presided at the piano. 玛丽负责弹钢琴。
- She presided at the piano throughout the concert. 音乐会自始自终由她主奏钢琴。
- The singer was accompanied at the piano by Mary. 演唱者由玛丽担任钢琴伴奏。
- The general manager presided at the meeting. 总经理主持了会议。
- He was composing at the piano at the age of seven. 他7岁时就会钢琴作曲。
- The boy started pecking at the keys of the piano. 男孩开始在钢琴上乱弹一气。
- The singer was accompanied at the piano by his pupil. 演唱者由他的学生担任钢琴伴奏。
- The singer was accompanied at the piano by Mary . 演唱者由玛丽担任钢琴伴奏。
- The singer was accompanied by her sister at the piano. 这位歌唱家由她妹妹担任钢琴伴奏。
- The Prime Minister presided at the Cabinet meeting. 首相主持了内阁会议。
- The girl to play the piano at the concert is Mary. 将要在音乐会上弹钢琴的那个女孩是玛丽。
- He presided at the public dinner yesterday . 昨天，他主持了宴会。
- Mr.Smith presided at the banquet yesterday evening. 昨天晚上史密斯先生主持宴会。
- She will be performing at the piano. 她将演奏钢琴。
- His son is a precocious child who could play the piano at the age of three. 他的儿子是一个三岁就能弹奏钢琴的早慧儿童。
- He will be performing on the flute [at the piano]. 他将吹奏长笛[弹奏钢琴]。
- For example: The girl to play the piano at the concert is Mary. 将要在音乐会上弹钢琴的女孩叫。
- He presided at the public dinner yesterday. 昨天,他主持了宴会。
- He is practicing on at the piano. 他在练习弹钢琴。
- You don' t practise enough at the piano. 你钢琴弹奏练习得不够.
