Don't be afraid to ask if you don't understand.

你要是不懂，尽管问好了。

《牛津词典》

Don't be afraid to haggle: for the moment, it's a buyer's market.

别怕讨价还价：目前是买方市场。

《柯林斯英汉双解大词典》

If your original request is denied, don't be afraid to pursue the matter.

如果你最初的要求被拒绝了，不要害怕去追问这件事情。

《柯林斯英汉双解大词典》

And for scares without the vampires, there's "Don't Be Afraid of the Dark."

VOA: special.2011.06.20

Don't be afraid to spend money on it.

所以不要吝啬在这方面花钱。

准备LSAT的时候 - SpeakingMax英语口语达人

don't you be afraid,sweet heart. Death is just a part of life.

VOA: standard.other

"Don't be afraid to step out and do what you want to do, " he said.

CNN: First NBA player with MS takes the court

His kitchen credo is: Choose the best elements available and don't be afraid to be playful.

WSJ: Paul Kahan's Apple Salad With Chicories, Pecans & Gorgonzola | Slow Food Fast

Don't be afraid to bargain, Lahana adds, especially if you're planning a road trip to several cities.

CNN: Money-saving ideas for Major League junkies