多谢大家的回复

Contract 上是写到：我shall be entitled to join the company retirement plan.  The company will contribute to the retirement plan.  The level of the company contribution is in the range of 10% to 25% of my salary.

看上去，也没太多必要去争了，只是觉得这公司有的莫明其妙，之前问过公司老板这事，他也一直没说这policy, 直到最后离开时才讲