breathless

形容词 breathless:

1. not breathing or able to breathe except with difficulty
   同义词：dyspneic, dyspnoeic, dyspneal, dyspnoeal
2. tending to cause suspension of regular breathing
   同义词：breathtaking
3. appearing dead; not breathing or having no perceptible pulse
   同义词：inanimate, pulseless

1. The children are breathless as they watch the tightrope act.
   孩子们在看走绳索表演时呼吸都屏住了。
2. A breathless audience.
   屏住呼吸的观众
3. I met him in a hot and breathless afternoon.
   我是在一个又闷又热的下午遇到他的。
4. I was completely breathless when I got to the top of the mountain.
   当我到达山顶上时，我已经上气不接下气了。

breath.less

adj.（形容词）
Breathing with difficulty; gasping:
呼吸困难的；气喘吁吁的：
例句：
was breathless from running.
跑得上气不接下气的

Marked by the suspension of regular breathing, as from tension or excitement:
屏息的：以正常呼吸暂停为特点的，如出于紧张或激动：
例句：
a breathless audience.
屏住呼吸的观众

Causing or capable of causing the suspension of regular breathing; tense or exciting:
透不过气的：使或能使正常呼暂停的；紧张的或扣人心弦的：
例句：
a breathless flight.
令人喘不过气的飞行

Not breathing; without breath.
不呼吸的；没有呼吸的
Dead.
死的
Having no air or breeze; still:
无风而沉闷的：没有空气或微风的；静止的：
例句：
a breathless summer day.
一个无风且沉闷的夏日

【引伸】
breath.lessly
adv.（副词）
breath.lessness
n.（名词）