Based on the currently available test devices and measuring methods, it is quit difficult to accurately measure the vaporization rate of mineral matter in coal combustion process.

鉴于目前国内的实验设备和测量手段，精确测量煤燃烧过程中各种矿物质的气化率还存在很大困难。

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It may seem difficult to quit an addition, but don't you think it might be worth it?

也许看起来做到这些是很困难的，但是你不认为这是很值得的吗？

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When facing a difficult challenge it's easy to quit. Don't quit until you achieve your goal.

当面对艰难挑战时很容易退却。不达到目标不要退却。

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As your salary increases in the corporate world, it becomes more and more difficult to quit.

FORBES: Why You Should Quit Your Job

As a consequence, girls will often quit prematurely when faced with a difficult task.

FORBES: Women: Are We Our Own Worst Enemy?

It made life so difficult in the power industry, that some foreign investors quit in disgust, causing power shortages.

ECONOMIST: The scare stories��and the chaotic reality