It is observed that the crack impermeable model can be used under some condition.

结果表明，裂缝不可渗透的边界模型在一定条件下可以合理使用。

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It is observed that usually the solution becomes clear after 5 iterations of asking why.

据观察，通常问了五个为什么以后，相应的解决方案也逐渐明朗了。

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It is observed that linear free energy relationship (LFER) exists in the ternary systems.

观察到在三元体系中存在着直线自由能关系(LFER)。

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And it is important we make sure those sanctions stick " Asked about North Korean threats, Biden observed that, as he put it, "They say a lot of things."

VOA: standard.2009.06.14

It is sometimes observed that it is called interference because it interferes with the rules of human experience and logic.

FORBES: Patent Reform 2013 -- The "America Invents Act" -- Much Ado

It is often observed that China has a strong interest in a revitalized U.S. economy.

FORBES: China May Not Be A U.S. Ally, But It's Also Not An Adversary

It is sometimes observed that places that once formed part of Charlemagne's empire France, Germany, Italy, the Netherlands have been much more at ease with the modern-day drive for European unity than areas that fell outside it, notably Britain and Scandinavia.

ECONOMIST: European unity