彼、今のところは飛ぶ鳥も落とす勢いだけれど、あの威勢いつまでもつのか、疑問だね。

He's unstoppable right now but the question is how long he can remain at the pinnacle of his career.

彼、一気呵成に書き上げたと言ってたけど、この提案書、少し雑だね。

He said he dashed this proposal off in one sitting. It's pretty sloppy.

彼、今日、精彩がないね。青菜に塩だね。

He seems really depressed and lifeless today. I wonder what took the wind out of his sails.