shield
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：
This paper is based on the background of shield method in subway tunneling construction.
本文以盾构法地铁隧道施工为工程背景。
He shielded his head from the sun with an old sack
他用一只旧口袋挡住头顶的阳光。
He added that the planned missile shield would cover Russia's territory up to the Ural Mountains.
他补充说，计划中的导弹防御系统将覆盖一直延伸到乌拉尔山脉的俄罗斯领土。
They took action in the shield of the police.
他们在警方的掩护下采取了行动。
It works well in resisting interference of control cables shield and protecting the cables in seriously corrosive environment.
它对控制电缆的屏蔽干扰和重腐蚀环境中电缆的防护都有较好的效果。
Thorn not break the shield and what are thorn in the broken spear can not co-exist.
刺不破的盾和什么东西都刺得破的矛不可能同时存在。