We signed up for the company talent show just for a lark, and somehow won.

我們只是好玩報名公司才藝表演，沒想到竟然得獎了。

On a lark, the sales team took the scenic train route to the client meeting.

業務團隊一時興起，搭了風景優美的火車路線去參加客戶會議。

She applied for the overseas position on a lark and was surprised to get hired.

她一時興起應徵了海外職缺，結果被錄取，讓她很驚訝。