guard
单词辨析：
普通用词，指采取手段使某人不生病或某物不受损害等。
Physical exercise can protect you against the flu.
体育锻炼可以预防流感。
What shall I do to protect my car against rust?
怎样才能防止汽车生锈？
She closed the window to protect the books from the rain.
她关上窗户防止雨水把书淋湿。
通常指用武装力量保护，使某人、某物、某处免受袭击。
The Great Wall was once used to defend against military aggression.
长城曾用来防御军事侵略。
He was sent to defend the border three years ago.
3年前他被派去守卫边疆。
指警惕地守护以防止造成伤害、损失等。
The command told those two soldiers to guard the entrance.
指挥官叫那两名士兵守着入口。
A lioness guarded her cubs.
一头母狮守护着幼狮。
通常指保护人、企业等免受伤害或损失。
import tariffs that shield enterprises from foreign competition
保护企业免受外国竞争威胁的进口关税
His wife lied to shield him when she took the stand.
他的妻子在出庭作证的时候为保护他而撒了谎。
She drew the curtains, shielding her eyes from the sun.
她拉上窗帘，使眼睛免受阳光照射。
相关例句：
Charm the audience and catch them off guard
吸引观众的注意力，然后给他们来个出其不意。
It takes me a long time to drop my guard and get close to people.
我要花上好长时间才能放下戒备心，与人接近。
They drugged the guard dog with doped meatballs
他们用掺了麻醉药的肉丸子麻醉了看门狗。
One young policeman stood guard outside the locked embassy gates.
一位年轻的警察在大门紧闭的使馆外站岗。
In the guard's van lay my tin trunk.
我的铁皮箱放在了卫兵的行李车厢中。
These weapons also had a heavy brass guard which encased almost the whole hand
这些武器还有一个沉重的黄铜护手，几乎把整个手都包住了。