Developing a function that requires communication between two distributed components can be surprisingly difficult when you consider all the possible failure scenarios.

考虑到所有可能的出错情况，开发一种需要在两个分布式组件之间实现通信的功能可能会异常困难。

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While English can be difficult to learn, it is a very useful tool for communication.

尽管英语学起来可能有点难，但它是非常有用的交际工具。

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English can be difficult to learn, it is a very useful tool for communication.

尽管英语难学，但它对于交流很有用。

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Adrienne Boissy, director of the Center for Excellence in Healthcare Communication at Cleveland Clinic, says the emphasis on getting good communication grades can be frustrating, especially when dealing with difficult patients or conditions with no good treatments or cure.

WSJ: Talking Cure for Health Care: Improve Doctors' People Skills

It can also be difficult to measure the value of communication.

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