[yī kǒu qì]
（一口氣息） one breath
draw a deep breath
深吸一口氣
with a long sigh
長嘆一口氣
breathe [give; heave] a sigh of relief
寬慰地松了一口氣
He slowly sat on the seat with a sigh.
他嘆了一口氣， 慢慢地坐到位子上。
rush to one's home at one go
一口氣跑到家
He finished reading the novel at one sitting.
他一口氣讀完了那本小說。