guard of honour

a group of soldiers ceremonially welcoming an important visitor

儀仗隊

keep (或 stand) guard

act as a guard

站崗，放哨

off guard

unprepared for some surprise or difficulty

猝不及防，喪失警惕

the government was caught off guard by the unexpected announcement.

政府被這突如其來的聲明弄得措手不及。

on guard

on duty to protect or defend something

站崗，放哨；值班

raise one's guard

adopt a defensive posture

擺出防御姿勢

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)（擊球員）站到正確的擊球位置

under guard

being guarded

在看守下，在警衛(wèi)下

he was held in an empty stable under guard.

他被關(guān)在一個有警衛(wèi)看守的空馬廄里。

off (one's) guard

Not alert; unprepared.

不警覺的；未準(zhǔn)備的

on (one's) guard

Alert and watchful; cautious.

謹(jǐn)慎的：警覺且戒備的；謹(jǐn)慎的

stand guard

To keep watch.

監(jiān)視，守望

To act as a sentinel.

擔(dān)當(dāng)哨兵的工作