1. 形容詞
   開的, 開著的
   打開的
   開放的
   公開的, 公然的
   空曠的, 開闊的
   (工作、職位等)空缺的
   無頂的
   未定的, 懸而未決的
   出入自由的, 可以自由參加的
   (母音或音節)開的
   

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   同義字詞
   clear,cleared,free,unclogged,unclosed,unobstructed,unstopped
   free-for-all,public,unrestricted
   endangered,exposed,liable,sensitive,subject (to),susceptible,vulnerable
   candid,direct,forthcoming,forthright,foursquare,frank,free-spoken,freehearted,honest,openhearted,outspoken,plain,plainspoken,straight,straightforward,unguarded,unreserved,up-front
   bald,bare,denuded,exposed,naked,peeled,stripped,uncovered
   public
   pending,undecided,undetermined,unresolved,unsettled
   broad-minded,open-minded,receptive
   bighearted,bounteous,bountiful,charitable,free,freehanded,freehearted,fulsome,generous,liberal,munificent,openhanded,unselfish,unsparing,unstinting
   

2. 動詞
   不及物動詞:
   (門、窗、蓋子、電腦文檔、程式等)打開
   (門、窗、蓋子、花等)開
   (股市等)開盤, 開市
   (眼睛)睜開
   (嘴巴等)張開
   展開
   (活動、會議等)開始
   (故事、電影、戲劇等)開頭|開場, 開演
   開幕, 開業
   

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   同義字詞
   unclose
   clear,free,unclog,unplug,unstop
   expand,extend,fan (out),flare (out),outspread,outstretch,spread (out),stretch (out),unfold,unfurl
   clear,free,unblock
   begin,commence,embark (on or upon),enter (into or upon),fall (to),get off,kick off,launch,lead off,start,strike (into)
   

3. 名詞
   公開賽
   /以上複數為"opens"/
   限定單數the open:
   野外, 曠野
   戶外, 空地
   an open house/
   open houses:
   開放參觀日
   (出售房屋的)看房時間
   家庭招待會
   

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   同義字詞
   nature,open air,out-of-doors,outdoors,wild,wilderness
   

4. 感嘆詞
   open up:
   開門!
   開口!
   

例句

1. Peru, IL: Open Court, 1999.
2. Open daily 11:30am-10:30pm.
3. The restaurant is still open .
4. This will open on 14 March 2011.
5. It is open to hiking and bicycling.
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