Trainee
noun
研修 is a training or study of some kind. If it's in your current life (生) that you are doing the training, then you are a trainee. This is a lot like how a student is in the status of "study life."
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own. The reading from 研修 should also help you too.
私は今、工場で研修生として働いています。
I am currently working as a trainee at the factory.
研修生の時期に学んだことが、今の仕事にとても役立っています。
What I learned during my time as a trainee has been very useful in my current job.
新しい研修生たちが今日からオリエンテーションを受けています。
The new trainees are attending orientation starting today.
こちらが、新しい研修生の三浦くんです。
This is the new trainee, Miura.