“变卦”造句

昨天他变卦了，说提价只是试行。
Yesterday he changed his tune, saying the fare increase was experimental.

你从今天早上就变卦了，是不是？
You've changed your tune since this morning, haven't you?

他因为在几个关键问题上临场变卦而备受批评。
He has been criticized for flip-flopping on several key issues.