| 单词 | guard |
| 释义 | guard vt.守卫，保卫〖同〗defend/vi.(against)防止，防范〖同〗keep safe/n.警卫员，看守，卫兵 〖题〗The policemen were on duty around the clock to ___ the city against attack. A.protected B.defend C.guard D.promise 〖解〗答案C。句意：警察们昼夜值勤，以守卫城市不受袭击。A，B，C3个词意思接近。guard警卫，保卫，强调警惕性；protect指首先采取预防措施“保护”；defend捍卫，强调抵抗，保卫自己。 〖词组〗catch sb. off(sb.'s) guard（问题等）使某人无法防守；drop one's guard丧失警惕；on guard留心，在岗上；guard against sth.防止；stand/mount/keep guard over守卫着；under guard在保护之下 |
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