Do you have firsthand knowledge that the Earth is round (a sphere)?

你真的有第一手信息来说明地球是圆的(或一个球体)吗？

youdao

He also has firsthand knowledge of the problems an incorrectly set clock can create.

他也掌握了许多由于生物钟紊乱而引起的问题的第一手资料。

youdao

Drawing attention to the fact that you have firsthand knowledge early on is helpful for the hiring manager.

让人事部经理注意到你早有经验这一事实，这在他们眼中属有用信息。

youdao

(...) He says he thinks that it is good that the Obama administration is seeking to get firsthand knowledge of the effects that the war against terrorism is causing the U.S.ally.

VOA: standard.2009.10.30

He's been talking with a senior U.S. military official with firsthand knowledge of operations in Somalia.

NPR: Somalia Raids Were Long in the Making

So often in life people can only appreciate what they have firsthand knowledge of.

FORBES: Every Person Matters in a Company, and There is No Such Thing as an Insignificant Position

There were no apparent constraints Monday, the law enforcement source with firsthand knowledge of the investigation said.

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