5. Please don't hesitate to... 请随时……
◆ 疯狂讲解
这当然是个“五星级” 的高级句型！有个类似的说法是：“Please feel free to….”。

Kim’s Note:
This is one of those super-impressive sentence patterns that makes you sound not only like a native speaker, but also a professional and eloquent native speaker.
这是个最具影响力的句型之一，它能使你听起来不仅像个美国人，而且像个很专业、很健谈的美国人。
◆ 疯狂操练
Please don’t hesitate to call me if you need more information.
（如果你还要更多的信息，请随时打电话给我。）

◆ 疯狂实战
A: Please don’t hesitate to ask questions if you don't understand.
B: Thanks for your patience.
A: 如果你们不懂的话，请随时问我。
B: 谢谢你的耐心。