这里的close是动词，意为"关闭"，而keep后要加形容词，所以要用close的过去分词形式closed作形容词。作形容词用的close意为"近的"、"亲密的"。
[1]形容词,动词,相关知识点ready为形容词，而不像中文中准备为动词。［误］ You must ready at once.［正］ You must be ready at once.［析］ ready为形容词，而不像中文中准备为动词。
［误］ It is cold outside. Please keep the door close.
［正］ It is cold outside. Please keep the door closed.
［析］ 这里的close是动词，意为"关闭"，而keep后要加形容词，所以要用close的过去分词形式closed作形容词。作形容词用的close意为"近的"、"亲密的"。
[2]close单词记忆法◆记忆方法一：分析：c --- ―窗‖的拼音首字母 lose --- 失去 记忆方法：关上窗，就会失去外面的世界。◆记忆方法二：分析：clo—城楼；se— 蛇；记忆方法：关闭城楼大门后， 蛇都无法钻进来。◆记忆方法三：联想方式：c猫；lo10；s蛇记忆方法：猫靠近10条蛇都不害怕
closed相关单词意思与记忆法：
closed单词意思解释释义：
a. 关闭的, 限于少数人的【计】 关闭指令【化】 闭合的; 闭路的
close相关单词意思与记忆法：
close单词意思解释释义：
n. 结束, 完结a. 靠近的, 亲近的, 亲密的, 严密的, 关闭的, 狭窄的, 秘密的vt. 关, 结束, 使靠近, 封闭, 使接近vi. 关闭, 结束, 靠近ad. 接近地, 紧密地【计】 关闭【化】 闭合; 接通【经】 收盘, 休市; 收盘相关词组: close over close round close up close upon close with come to a close draw to a close be close at hand be close by be close to bring to a close close about close down close to close off close out
close单词记忆法：
◆记忆方法一：
分析：c --- ―窗‖的拼音首字母 lose --- 失去
记忆方法：关上窗，就会失去外面的世界。
◆记忆方法二：
分析：clo—城楼；se— 蛇；
记忆方法：关闭城楼大门后，
蛇都无法钻进来。
◆记忆方法三：
联想方式：c猫；lo10；s蛇
记忆方法：猫靠近10条蛇都不害怕
closed单词相关例句：That is a good book which is opened with expectation and closed with profit. 好书开卷引人入胜，闭卷使人得益。
The road was closed by a barrier.
这条路被一个路障封锁了。
The ship ride closed to shore will set sail tomorrow.
近岸停泊的那艘船将於明日起航。
We are closed every Monday.
我们每周一休息。
The library is closed to the public at dusk each day.
图书馆每天黄昏时刻停止开放。
The surgeon closed the incision with stitches.
外科医生缝合了伤口。
The floodgate is closed to control the flow of water
为了控制水流，防洪闸门关闭了。
The municipality has/have closed the swimming pool.
市政当局已关闭了那个游泳池。
He held both sides of the parka hood closed against the snow.
他捏紧皮外套上风帽的两边以挡住袭来的飞雪。
The canal has been closed to shipping.
这条运河已对所有的船舶关闭。
close单词相关例句：A wise head makes a close mouth. 智者寡言。
Very close and trusted friends share confidences candidly. They feel secure that they will not be ridiculed of derided ,and their confidences will be honored.——Robert Louis Steveson, British novelist and poet 亲密而互相信任的朋友之间彼此赤诚相见，他们不会被戏弄和嘲笑，因而心理踏实无虑，他们之间这种信任会受到尊重。英国小说家、诗人 史蒂文森.R.L.
With close friends in their lives ,people develop courage and positive attitudes.Teenagers have the moral support to assert their individuality;the elderly approach their advanced years with optimism and an interest in life.——Ralph Waldo Emerson. American thinkerA man is either free or he is not. There cannot be any apprenticeship for freedom.I Baraka. French Writer 人要么是自由的，要么是不自由的，从来就不存在过渡阶段。法国作家巴拉卡 A.
The patient is very close with her nurse.
病人跟她的护士很亲近。
Don't go too close to the edge of the steep cliff!
别站得离悬崖太近了！
Nothing in life is permanent, but a diamond comes close to it.
人生中没什么是永恒的，但是钻石很接近永恒。
It feels bad to have a door close on you.
对着一扇关闭的门感觉很糟。
The dog and its master are close to each other.
这条狗和他的主人很亲密。
external 一般指远离事物 /人 /国家 /机构等的事情，强调的是事物本身之外的，外来的，外界的等。 exterior 那么指事物或人外表的，可以是事物本身的外表，外部构造，外表或外形等。
external pressure 环境压力，外部压力 与 external 相对的是 internal ，表示国内的，内部的。
例句： He pays close attention to both internal and external events .
他很关注国内外大事。
Your argument just won't stand up (to close scrutiny).
你的论点经不起(仔细)推敲。
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