Vendors were doing a brisk trade in souvenirs.

　　小販們的紀(jì)念品生意很興隆。

　　There's nothing like a brisk walk on a cold day!

　　冷天出來快步走走，簡直太舒服了。

　　He felt strangely exhilarated by the brisk, blue morning.

　　他由于一個生氣勃勃、藍色的早晨而感到奇怪地極度興奮。