existing or arranged permanently, not formed or made for a particular situation
a standing army
常备军
(BrE)
a standing charge (= an amount of money that you pay in order to use a service, such as gas or water)
长期支付的开销
a standing committee
常务委员会
It’s a standing joke (= something that a group of people regularly laugh at).
那是一个活笑柄。
We have a standing invitation to visit them anytime.
他们邀请我们随时去他们家做客。