英语单词年限请帮助解答

seniority

看一下例句你大概会知道怎样来表达：
1. 养老金的多少取决於为公司服务年限的长短.
Size of pension depends on length of service with the company.
2. 晋升以服务年限为准。
Promotion will go by length of service.
3. 我受教育的年限加起来共十年。
Ten years was the sum total of my education