It is unbelievable that you'll refuse to pay.

难以置信，你们会拒付。

It is unbelievable that he did it for himself.

他独力做了那件事，真是令人难以置信。

It is unbelievable that the skirts are so cheap.

真不敢相信这些裙子如此便宜。

'It is unbelievable that this is being sent to schools', he said.

“难以相信这将被送进学校”，他说。

It is unbelievable that the car runed over 2,000 kilometers in a day.

很难相信这辆车一天行驶了超过2000公里。