almost 中文

[ɔːl.ˈməʊst]

[ˈɔːl.məʊst]

[ˈɔl.moʊst]

[ˈɑl.moʊst]

[-əʊst]

US-Inland North

副几乎, 差不多维幾乎

在數學中，尤其是在集合論裡，若談及無限集合，幾乎這一詞會被用來指「除了有限多個之外的所有元素」。
換句話說，一無限集合 L 的無限子集 S 幾乎是 L ，若其差集 L\S 是有限的。
例子：
對任意在自然數 N 中的 k 而言，集合幾乎是 N ，因為只會有有限多個少於 k 的自然數。
質數的集合不幾乎是 N ，因為存在無限多個不是質數的自然數。
幾乎在概念上和測度論的「幾乎處處」很相似，但不完全一樣。例如，康托爾集合是個不可數集合，但卻為零勒貝格測度。所以，一個在 (0,1) 間的實數「幾乎處處」是康托爾集合的補集，但說康托爾集合的補集「幾乎」為 (0,1) 的實數則是不正確的。

Definition of almost in English Dictionary

名词 (Noun)PLalmostsSUF-most
1. INF Something or someone that doesn't quite make it.
  1. In all the submissions, they found four papers that were clearly worth publishing and another dozen almosts.
副词 (Adverb)
1. Very close to, but not quite.
  1. Almost all people went there. - Not all but very close to it.
  2. We almost missed the train. - Not missed but very close to it.
更多范例
1. 用于句中
  - When there is very heavy rainfall on California hillsides over a prolonged period, there is almost always ensuing surface runoff.
  - It’s a lovely little studio with almost a river view.
  - Afterwards there was apple-pie and cream and a welsh rarebit. Peregrine said it was almost up to prison fare.
2. 用于句首
  - Almost any melt-processable polymer can be fabricated into kilometers of nanolayered films, and layers less than 10 nm in thickness have been made.