I do know how upset the shop staff can get, but I try to persuade them to keep smiling.

我知道店员会有多生气，但我努力说服他们保持微笑。

youdao

I didn't mean to keep smiling.

我不是刻意地保持微笑。

youdao

Didn't mean to keep smiling.

我不是刻意地保持微笑。

youdao

He helped teach Raymond the finer points, including to keep smiling and to keep moving.

WSJ: 2 guys have a ball as Michael Jackson on Broadway

In the end, the most important thing you can do for your customers is to keep smiling.

FORBES: Connect

Barely a woman with only a song, I sang to keep you smiling and held you all night long.

NPR: Judy Collins, From Both Sides Now