... 当然,所谓的移除是指这个键将不再存在于这个杂凑,而不是指让这个键对应的杂凑值消失。所以并不是把需要被delete的这对键值设为undef。也就是说,即使有一个键所对应的杂凑值为undef,那这个键依然被视为存在(exists)的,这在刚刚解释exists这个函数的例子中就可以了解了。
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As if everything that exists 似乎一切都有了 ; 仿佛所有都有了 ; 仿佛所有皆有了
NOT EXISTS 不存在 ; 子查询 ; 它会调用关联子查询
case study exists 存在问题分析
file already exists 文件已经存在 ; 文件已存在
what exists 对存在
beauty exists 美的存在 ; 美存在 ; 美容存在
growth exists 增长存在 ; 成长存在 ; 经济增长存在
God exists 上帝存在 ; 上帝安在
This article proceed from exists, proposing and proving the new version of Marxist practical philosophy. Thus articulating and explorating Marxist practical philosophy deeply.
本文从生存论出发,提出并论证马克思实践哲学的新视野,从而对马克思的实践哲学思想进行深入挖掘和阐释,彰显其生存实践论的独特内涵。
参考来源 - 生存实践论:马克思哲学的生存论转向 (研究生论文)·2,447,543篇论文数据,部分数据来源于NoteExpress
V-I If something exists, it is present in the world as a real thing. 存在 [no cont]
He thought that if he couldn't see something, it didn't exist.
他认为如果他看不见某种东西,它就不存在。
Research opportunities exist in a wide range of areas.
研究机会存在于广泛的领域中。
V-I To exist means to live, especially under difficult conditions or with very little food or money. (尤指在困境中) 生存
I was barely existing.
我几乎活不下去了。
Some people exist on melons or coconuts for weeks at a time.
有些人一度数周靠各种瓜与椰子生存。
Racism exists at all levels of society.
种族主义存在于社会各阶层。
A culture of failure exists in some schools.
在某些学校中存在着失败文化。
A danger exists of the conflict becoming internationalized.
存在着冲突变得国际化的危险。
But in the end there is hope for this singer, who exists only in a movie and its soundtrack.
VOA: special.2010.02.22
In fact, it exists, amazingly, in order to hinder understanding in the kinds of texts that we're inclined to call "poetic."
事实上,它的存在,阻碍我们理解所有带有,诗性的文本“
God is a product of human labor, but then we turn around and we say God exists independently and has value objectively.
上帝是人类劳动的产物,但我们转过身却说上帝独立地存在,并且具有客观价值。
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