servo-mechanism

n any mechanism that controls a larger mechanism 伺服机构.

service, service area, service break, service charge, service flat, service road, service station, serviceable, serviceably, serviceman, services, servicewoman, serviette, servile, servilely, servility, serving, servitude, servo, servo-, servo-motor, servo-system, sesame, session, set, set a goal, set about, set apart, set aside, set back, set down, set fire to, set forth, set free, set in, set light by, set off, set on sb, set oneself against, set oneself up as,