一邊響一邊慢慢移動
聲音加上移動：東西往前走，而且一路都在發出那個聲音。
verb · B2
If a boat, train, car or other engine-driven thing chugs somewhere, it moves there slowly while its engine makes a low sound over and over.
突突地開
核心畫面
You can think of chug as a noise that turned into a word: a low, heavy sound that keeps repeating, chug, chug, chug. It is the sound of something working hard and not working fast. Every use grows out of that beat. A boat moves at the speed of its own engine noise. A business keeps going without ever speeding up. A computer labours and falls behind. Even a throat swallowing a whole drink without a break has the same repeated, rhythm.
chug 可以想成一個把聲音寫成字的詞：低低的、重重的，而且一直重複，突、突、突。那是某個東西很吃力、但一直沒停下來…更多收起
chug 可以想成一個把聲音寫成字的詞：低低的、重重的，而且一直重複，突、突、突。那是某個東西很吃力、但一直沒停下來的聲音。之後的每個意思，都可以想成從這個節奏長出來。船以自己引擎聲的速度前進。生意不快，但一直在動。電腦硬撐著、跟不上。連一口氣把飲料喝完，喉嚨也是同一種不中斷的重複節奏。From the word’s history
The source records chug as onomatopoeic, made in imitation of a working steam engine, which is exactly the beat the modern uses still carry.
來源記載 chug 是擬聲詞，模仿蒸汽引擎工作時的聲音。今天各個用法帶著的那種重複節奏，正好跟這個來源對得上。
Wiktionary (kaikki extract, source_ref kaikki:3f6f69a190036ae4:614094958), etymology 1 for chug: Onomatopoeic, in imitation of a working steam engine.
Three branches
慢而不停／吃力地運轉
聲音淡掉了，留下來的是節奏：不快，但沒停。
verb · B2
To keep going slowly but steadily, without stopping and without ever getting faster, used about things like a business, an economy, a project or someone's work.
慢慢但持續地前進
一口氣喝到底
同一個來源的擬聲，只是這次響的是喉嚨：一下接一下，中間不換氣。
verb · B2
To drink all of a drink in a glass, bottle or can in one go, without stopping to breathe.
一口氣喝完