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- 弹钢琴的人把乐谱忘了，只好即兴伴奏。
The pianist forgot his music and had to improvise (the accompaniment).
- 他演唱由钢琴伴奏。
He sang to a piano accompaniment.
- 那位演唱者的姐姐用钢琴给她伴奏。
The singer was accompanied at/on the piano by her sister.
- 这位歌唱家由她妹妹担任钢琴伴奏。
The singer was accompanied by her sister at the piano.
- 演唱者由他的学生担任钢琴伴奏。
The singer was accompanied at the piano by his pupil.
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