be at someone's service

be ready to assist someone whenever possible

听某人吩咐

be of service

be available to assist someone

可以给某人帮助

in service

in or available for use

在使用；可供使用

(dated)employed as a servant

(旧)当仆人

out of service

not available for use

不可使用

see service

serve in the armed forces

参军服役

he saw service in both world wars.

两次世界大战他都服过兵役。

take service with

(Brit. dated)become a servant to or worker for

(英,旧)为…帮佣；为…工作

government officials took service with the new rulers.

政府官员为新的统治者工作。