[詞典] shifty; as changeable as clouds and rain; blow hot and cold; change attitudes constantly; fickle as human feelings;
[例句]他這個人翻雲覆雨，弄不清他究竟主張什麽。
He's a man given to blowing hot and cold; you just can't tell what he's standing for.
厚積薄發
[詞典] accumulate richly and break forth vastly;
[例句]今天的合肥，已邁入壹個厚積薄發、加速崛起的新階段。
And today's Hefei is entering a new stage of well-grounded development and accelerated emergence.