I'll kill two birds with one stone and shop on the way home.
我回家的路上順便買東西，一次搞定兩件事。
Cycling to work lets me kill two birds with one stone, exercise and save money.
騎腳踏車上班讓我能一舉兩得，既運動又省錢。
He killed two birds with one stone by studying abroad.
他靠出國唸書，一次達成了兩個目的。