"This is certainly the heart of an old maid," thought he.

“这一定是一个老姑娘的心。”他想。

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This is certainly a theoretical risk but in practice there is seldom a problem.

这在理论上肯定有风险，但在实践中却很少出问题。

《柯林斯英汉双解大词典》

This is certainly turning rubbish into a national treasure.

这无疑是在把垃圾变成国宝。

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"This is certainly a setback," Both Ablin and Romer appeared on Bloomberg Television.

VOA: standard.2009.07.02

You might remember vaguely logarithms from high school math and such but what this suggests for us , the computer scientists, is that this is certainly a smarter, a faster algorithm.

你可能还会依稀记得,高中数学里的对数,这就给了我们这些计算机科学家们，一些启示,即，这种算法更智能，更迅速。

哈佛公开课 - 计算机科学课程节选

Indeed,let me take a moment and read a poem that emphasizes this thought, because this is certainly one central,very bad thing about death.

事实上，让我念一首诗来强调它，因为这确实是死亡的主要坏处。

耶鲁公开课 - 死亡课程节选

"She will have a long course ahead, and this is certainly not over, " Dr. Rodriguez said.

WSJ: Last Boston Marathon Bombing Patient, Erika Brannock, Released From Hospital

This is certainly a major molecular mechanism of how breast cancer metastasizes to the lymph nodes.

BBC: tumour in breast

This is certainly no time for clashes or wars on ethnic, religious, or ideological grounds.

FORBES: World Bank Sets Up $75 Million Fund For South Sudan