It is difficult to believe that a substance originally found in the bark of the humble willow tree could cause so much heat.

最初来源于柳树树皮的这种成分竟然能够发光发热，实在是叫人难以置信。

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It can be difficult to figure out the JNDI tree of a target server if you are unfamiliar with what was deployed there.

如果用户不熟悉这里的部署，那么想弄清楚目标服务器的jndi树是很困难的。

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"I recognize that when they are my age, it'll be difficult to find a 'dead-tree book,'" he added.

“我意识到等她们到了我的年纪，就很难再看到纸质书了，”他补充到。

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Let me just close by saying here on the South Lawn there is actually a Lebanese cedar tree that was planted 30 years ago, a testimony to difficult times for both the United States and Lebanon, but also the fact that we remain hopeful about the future.

WHITEHOUSE: President Obama Meets with Lebanese President Sleiman

Soon, it becomes a huge tree and it becomes extremely difficult to discern one twig from another, even though the path to get there might be totally different!

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