Definition: forming a part of something Level: A2
他曾是一支著名摇滚乐队的主唱。
He used to be the lead singer ___in a famous rock band.
这本历史书里有很多有趣的事实。
There are many interesting facts ___in this history book.
她在学校的管弦乐队里拉小提琴。
She plays the violin ___in the school orchestra.
