Foreign coaches don't speak Chinese, so communication is difficult.

外国教练不会讲汉语，沟通很困难。

youdao

Communication is difficult. Please send every word or group of words twice.

通信困难，请把每个词(组)发送两遍。

youdao

Studying Aalto may help us not to consider him as the ultimate great genius with whom communication is difficult but, on the contrary, to appreciate his capacity for generous communication.

研究阿尔托也许能帮助我们不将他视为一个难于沟通的绝世天才，恰恰相反，我们应当欣赏他的坦陈，他的大度和包容。

youdao

In particular, they will argue that in some internet use - particularly social media sites - it is difficult to distinguish between the details of the communication and the actual content of the message.

BBC: Computer keyboard and mouse

"The fact we've agreed to keep lines of communication open, even in difficult times and even when disorder ignites, is critically important, " he said.

BBC: Cardiff talks should make Northern Ireland summer 'safer'

The task may be difficult, but it is not beyond the capabilities of a competent communication group.

FORBES: Four Ways to Increase the Urgency Needed for Change -- Part I