A pep talk is a speech intended to encourage someone to make more effort or feel more confident. 鼓舞士氣的講話

Powell and Cheney spent the day giving pep talks to the troops.

鮑威爾和切尼花了一整天給部隊作鼓舞士氣的講話。

The coach gave the team a pep talk before the big game.

大賽之前，教練向隊員講話，給他們打氣。

The coach gave them a pep talk.

教練跟他們說了一番打氣的話。

[informal] If you try to pep something up, you try to make it more lively, more interesting, or stronger. 使振奮; 使活躍; 使更有趣; 使更強大

The governor aired some ideas about pepping up trade in the region.

政府宣傳在該地區(qū)促進貿(mào)易的一些想法。

How about pepping up a bland sauce with chillies?

在淡而無味的醬料里加些辣椒怎么樣？

Pep up meals by adding more unusual spices.

加些特別的調(diào)料使飯菜味道更佳。

A walk in the fresh air will pep you up.

在清新空氣中散散步會使你精神振奮。

liven up

If a place or event livens up, or if something livens it up, it becomes more interesting and exciting. 變得更有生氣; 使…更有生氣

How could we decorate the room to liven it up?

我們怎樣才能把這房間裝飾得更有生氣呢？

The multicoloured rag rug was chosen to liven up the grey carpet.

挑選了多彩的碎呢毯子來使灰色地毯更有生氣。

If people liven up, or if something livens them up, they become more cheerful and energetic. (人) 更有生氣

Talking about her daughters livens her up.

談到她的女兒們使她更加神采飛揚。

huffingtonpost.com