1
something is hot air
表示某事物不切实际或虚假。
His promises are just hot air.
他的承诺只是吹牛。
空话；大话；吹牛
先理解核心含义，再看它在真实句子里的用法。
空话；大话；吹牛
Empty or exaggerated talk that has no real meaning or substance; bluster.
His promises are just hot air.
他的承诺只是吹牛。
被加热的空气,尤指用作热气球升力介质的空气。
Air that has been heated, especially so as to function as the lifting agent of a hot-air balloon.
空洞、混乱或夸张的言谈,缺乏意义或实质；空话。
Empty, confused, or exaggerated talk lacking meaning or substance; bluster.
His promises turned out to be nothing but hot air.
他的承诺结果只是吹牛而已。
The politician's speech was full of hot air and lacked concrete plans.
那位政治家的演讲充满空话，缺乏具体计划。
Don't believe his hot air about getting rich quick; he's just bragging.
别相信他快速致富的吹牛话，他只是在吹嘘。
表示某事物不切实际或虚假。
His promises are just hot air.
他的承诺只是吹牛。
形容某人爱说大话。
That politician is full of hot air.
那个政治家满口大话。
Not this
Don't listen to him; it's all hot airs.
Use this
Don't listen to him; it's all hot air.
英语中 'hot air' 是不可数名词，没有复数形式。'airs' 可能被误解为复数，但实际应为单数。
Not this
I saw a hot air in the sky.
Use this
I saw a hot air balloon in the sky.
'hot air' 指吹牛或空话，不是热气球。表示热气球需用 'hot air balloon'。
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Collins 词频等级为 1，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from ECDICT, WIKTIONARY.