eye-opener

1. N-COUNT If you describe something as an eye-opener, you mean that it surprises you and that you learn something new from it. 大开眼界的事物[非正式]

Writing these scripts has been quite an eye-opener for me. It proves that you can do anything if the need is urgent. 写这些脚本对我来讲是大开眼界的事。它证明如果需求紧迫，人能做任何事情。