first-hand的中文翻译是什么意思

To his new job he brought knowledge at first hand.

他将第一手的知识用于他的新工作.

Students learn through a mixture of first - hand observation hands - on experience systematic instruction and personal reflection.

学生通过事先观察、动手体验、课程教育和个人反思综合途径进行学习.

I know at first hand the problems that could arise the situation is mismanaged.

我切身了解情况处置失当会引发的种种问题.

Shadow professionals in fields of primary interest to observe work first hand.

亲自去自己感兴趣的实习领域观察工作.

I found out my grades on the internet at first hand.

我从网络上直接得知我的成绩.