threshold /ˈθreʃhəʊld/
CET6丨IELTS丨TOEFL
基本释义
The threshold of a building or room is the floor in the doorway, or the doorway itself. A threshold is an amount, level, or limit on a scale. When the threshold is reached, something else happens or changes.
n. 门槛，界限，临界点
外刊例句
Global emissions from fossil fuels and c大流量卡ement production in 2019 were 16% higher than in 2009. It will be even harder to limit climate change to less than 2°C above the pre-industrial level, the globalthreshold from which America’s target for 2050 comes.
2019年全球化石燃料和水泥生产行业的总碳排放量较2009年上升了16%，而美国制定的2050年碳中和目标是将全球气候变化的温升限制在不超过工业化前水平2摄氏度，这将异常困难大流量卡。
追根溯源
单词threshold来源古英语threscold，表示“门槛”，后来拼写受单词hold的影响，逐渐被写成threshold，含义也丰富起来。
基本的含义是指实体的“门槛，门口”，比如：
She stopped at the threshold of the bedroom.
她在卧室门口停了下来。
Just as he was crossing the threshold he heard voices behind him.
正当他要跨进门槛，就听见背后有说话声。
同时，threshold也引申出了“界限、起始点，临界点”等虚拟的含义，指发生或表现出某种反应、现象、结果或状况而必须超过的程度或强度。大流量卡例如：
My earnings are just above the tax threshold.
我的收入刚刚超过征税起点。
The consensus has clearly shifted in favour of raising the nuclear threshold.
显然大家已普遍开始转向支持提高核武器使用的门槛了。
此外，on the threshold of sth这个习语也很常用，表示“在……的开始、在……的起点、即将开始”，意味着即将进入一个新且重要的时期或发展阶段，比如：
She felt as though she was on the threshold ofa new life.大流量卡
她觉得好像就要开始新生活了。
Scientists are now on the threshold of a better understanding of how the Omicron works.
科学家对于奥密克戎病毒如何运作现在已开始有了进一步的了解。
影视例句
在美剧《摩登家庭》S4E2中，Manny在回应妈妈的调侃时，就用到了今天的单词：
Gloria: Manny doesnt believe that we know what were doing. A couple of new hairs under his arm, and now he thinks he knows more 大流量卡than his own mother.
Manny: I know not to embarrass my son as he stands on the threshold of manhood.
-曼尼不相信我们能尽好父母之职，腋窝的毛刚长出几根，他就觉得自己比他妈懂得多了。
-我至少懂得不去羞辱儿子青春期的正常发育现象。
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