serve in the army和join the army的区别

serve in the army和join the army的区别 --Dose Liu Hui serve in the army? join in the army里的in为什么要去掉 Does Liu Hui serve in the army?No,but he ___in the army for 1.-Does your brother serve in the army? 7. —Does Liu Hui serve in the army? —Does Liu Hui serve in the army? 一般来讲是join the army 还是 join army 还是join an army 是join the army（陆军）还是take part in army（陆军）? join the army.这个词组中army是否需要大写. Only after---reached eighteen---join the army. 分析一下英语句子Many of his classmates serve in the armyin the army