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VERB
（尤指向水中）縱身投入，一頭進入
If something or someone plunges in a particular direction, especially into water, they fall, rush, or throw themselves in that direction.
例句
At least 50 people died when a bus plunged into a river...
一輛公共汽車栽進河里，造成至少50人喪生。
He ran down the steps to the pool terrace and plunged in.
他跑下臺階來到泳池露臺，縱身跳進池里。
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VERB
將…投入；將…插入；將…刺進
If you plunge an object into something, you push it quickly or violently into it.
例句
A soldier plunged a bayonet into his body...
一名士兵將刺刀插進了他的身體。
She plunged her face into a bowl of cold water...
她把臉扎進一盆涼水里。
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V-ERG
（使）突然陷入；（使）突然遭受
If a person or thing is plunged into a particular state or situation, or if they plunge into it, they are suddenly in that state or situation.
例句
The government's political and economic reforms threaten to plunge the country into chaos...
政府的政治和經濟改革可能會使國家陷入混亂局面。
8,000 homes were plunged into darkness as electricity cables crashed down...
由于電纜損毀，8,000戶家庭頓時落入一片黑暗之中。
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V-ERG
（使）投身；（使）突然開始從事
If you plunge into an activity or are plunged into it, you suddenly get very involved in it.
例句
The two men plunged into discussion...
兩位男士立即投入到討論中。
The prince should be plunged into work...
王子應該積極參與工作。
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VERB
驟降；猛跌
If an amount or rate plunges, it decreases quickly and suddenly.
例句
His weight began to plunge...
他的體重開始銳減。
The Pound plunged to a new low on the foreign exchange markets yesterday...
昨天在外匯市場上英鎊驟跌至新低。
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PHRASE
決定冒險嘗試；采取斷然行動
If you take the plunge, you decide to do something that you consider difficult or risky.
例句
If you have been thinking about buying shares, now could be the time to take the plunge.
如果你一直在考慮購買股票，現在或許是采取行動的最好時機。