Typically, the youngest guys are twenty, and typically the oldest guys are 45, but everybody was liable to military service in these states until they were about 60.

一般来说,最年轻的二十岁,最年长的四十五岁,但是在有些城邦中,六十岁以下的人都能参军

耶鲁公开课 - 古希腊历史简介课程节选

He also didn't like military service.

这个王子也对兵役没兴趣

耶鲁公开课 - 欧洲文明课程节选

Throughout all of this, they are subjected to a course of rigorous study and physical training that will lead them to adopt prominent positions in the military and other branches of public service.

这一进程，需要他们遵循,严格的学习及体能的训练,以便他们顺利接掌重要的军职,及其它公共服务事项。

耶鲁公开课 - 政治哲学导论课程节选