中国人从中东获得了一种蓝色颜料，这是一种当时在中国很难得到的纯净的氧化钴，这种颜料只含有少量的锰。

From the Middle East the Chinese acquired a blue pigment—a purified form of cobalt oxide unobtainable at that time in China—that contained only a low level of manganese.

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在沙漠里水是很难得到的。

Water is scarce in the desert.

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真理总是很难得到的。

It is always difficult to get at the truth.

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It's also hard to get a job at Google. Right.

在Google要得到一份工作也是很难的，对。

哈佛公开课 - 计算机科学课程节选