guard of honour

a group of soldiers ceremonially welcoming an important visitor

仪仗队

keep (或 stand) guard

act as a guard

站岗，放哨

off guard

unprepared for some surprise or difficulty

猝不及防，丧失警惕

the government was caught off guard by the unexpected announcement.

政府被这突如其来的声明弄得措手不及。

on guard

on duty to protect or defend something

站岗，放哨；值班

raise one's guard

adopt a defensive posture

摆出防御姿势

take guard

(Cricket)(of a batsman) stand in position ready to receive the ball, especially having asked the umpire to check the position of one's bat with respect to the stumps

(板球)（击球员）站到正确的击球位置

under guard

being guarded

在看守下，在警卫下

he was held in an empty stable under guard.

他被关在一个有警卫看守的空马厩里。

off (one's) guard

Not alert; unprepared.

不警觉的；未准备的

on (one's) guard

Alert and watchful; cautious.

谨慎的：警觉且戒备的；谨慎的

stand guard

To keep watch.

监视，守望

To act as a sentinel.

担当哨兵的工作