Sales began to flag in the third quarter, so the team launched a new promotion.

第三季銷售開始下滑，因此團隊推出了新的促銷活動。

By the end of the four-hour meeting, everyone's energy was clearly flagging.

四小時的會議接近尾聲時，大家的精力明顯減弱了。

After a long overnight flight, my enthusiasm for sightseeing flagged quickly.

搭了一整夜的長途班機後，我對觀光的熱情很快就消退了。