guard的意思是:警卫;警戒;护卫;守卫;防护;警戒线;警戒线机制。
例句:The guard at the gate was very strict.
大门守卫非常严格。
guard against:预防,防止
guard duty:警卫,守卫
guard rail:栏杆,护栏
security guard:保安,警卫人员
under guard:在守卫下,在警戒下
guard post:哨所,警戒岗位
sentry guard:岗哨
guardianship:监护权,看护责任