The stifling heat of the little room was beginning to make me nauseous.

小房间里难以忍受的高温开始令我恶心。

《柯林斯英汉双解大词典》

The summer heat was stifling.

这个夏天热的让人几乎窒息。

youdao

But what really recalled her to him at this moment was the stifling heat of the afternoon, which had brought the sweat out on his forehead.

但此刻他真正想起凯瑟琳却是因为一个闷热的下午，热得他满头大汗。

youdao

She and her mother-in-law took the 10-hour bus ride down to Camp Bucca in the stifling heat of summer, only to find that she was not on the list of those authorized to see her husband.

NPR: U.S. Tries for Better Conditions at Iraq Prison Camp

In the stifling heat, both sides made a sluggish start but it was something of a surprise to see Mulgrew booked for time-wasting at a throw-in after just four minutes.

BBC: Alan slots home a first-half penalty for Braga