【mand】
“to order，to entrust” “命令，信任，委托”
|mandatory=mand+ory a.托管的；命令的
-ory “与···相关的”
eg: The mandatory retirement age is 60.
|command=com+mand v./n.命令；控制
com-“共同”
eg：The general commanded his troops to attack.
|countermand=counter+mand v.取消（命令）
counter-“反对，相反”
eg：I have now to countermand that order.
【词汇扩展】
remand n.送还 v.遣回
mandate n.授权，命令
demand n.要求v.查询
mandarin n.普通话
（以上均来自《200个一定要学的英文词根词缀》一书）
