求翻译：大二暑假开始则在校外兼职，在三星公司兼职促销过，在光明乳业公司兼职促销过，在烽火团集团兼职过，无一不让我体会到校外的打拼才是一种真正的锻炼，更能理解金钱与生活的不容易，更能让我们成长。是什么意思？

Sophomore in the school summer holidays began part-time, part-time sales over the Samsung, in Bright's part-time sales had, in the war group had a part-time group, and both made me realize the hard work is a true school of exercise, better understanding of money and life is not easy, but also allows