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(bad 的最高级)
Worst is the superlative of bad .
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(badly的最高级)
Worst is the superlative of badly .
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N-SING
最坏的事;最糟的情况
The worst is the most unpleasant or unfavourable thing that could happen or does happen.
例句
Though mine safety has much improved, miners' families still fear the worst...
尽管矿井的安全状况有了很大改善，矿工的家属仍然害怕最糟的情况会发生。
The country had come through the worst of the recession.
该国已经度过了经济衰退最糟糕的时期。
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(用于构成以 bad 和 badly 开头的复合形容词的最高级，如badly-affected的最高级是worst-affected)
Worst is used to form the superlative of compound adjectives beginning with 'bad' and 'badly'. For example, the superlative of 'badly-affected' is 'worst-affected'.
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PHRASE
最糟糕的是
You say worst of all to indicate that what you are about to mention is the most unpleasant or has the most disadvantages out of all the things you are mentioning.
例句
The people most closely affected are the passengers who were injured and, worst of all, those who lost relatives.
受影响最大的是受伤的乘客，那些失去亲人的乘客尤为甚。
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PHRASE
在最坏的情况下
You use at worst or at the worst to indicate that you are mentioning the worst thing that might happen in a situation.
例句
At best Nella would be an invalid; at worst she would die...
内拉往好里说会落下残疾，往坏处说可能会生命不保。
At the worst he would be there by the following night.
最不济他会在第二天晚上之前到那儿。
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PHRASE
在（心情、境况）最糟糕的时候
When someone is at their worst, they are as unpleasant, bad, or unsuccessful as it is possible for them to be.
例句
This was their mother at her worst. Her voice was strident, she was ready to be angry at anyone.
这是他们的母亲情绪最坏之时，她说话咄咄逼人，随时会对任何人发火。
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PHRASE
如果发生最坏的情况（if worst comes to worst 主要用于美国英语）
You use if the worst comes to the worst to say what you might do if a situation develops in the most unfavourable way possible. The form if worst comes to worst is also used, mainly in American English.
例句
If the worst comes to the worst I guess I can always ring Jean...
到了一筹莫展的时候，我想我总还是能给琼打电话。
He was asked whether he would walk out if the worst came to the worst.
他被问到如果发生最坏的情况他是否会退席。
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PHRASE
不择手段；使出一切手段;有什么手段尽管使出来
If someone does their worst, they do everything unpleasant that they can possibly do. You can say 'do your worst' to show someone that you are not frightened of what they may do.
例句
I think it was dangerous to say: look, we've got an army now — do your worst.
我觉得要是说“瞧，我们现在有一大群人——你有什么手段尽管使出来吧”，可能会引起麻烦。