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?
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。
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。
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