Do you have any difficulties in doing your project? If so, don't hesitate to tell me so I can give you a hand.
做这件事有什么困难吗？如果有，立刻告诉我，我可以帮你一下。
When you want to do a thing which is worth doing in your opinion, don't be hesitate;
当你想做一件你认为值得做的事，请不要犹豫；
Plesse do not hesitate to contact us for any further clarification. We look forward to doing business with you.
请不要犹豫联系任何进一步阐明，我们期待着与你做生意。
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