機器本身，以及它做的事
這一支就是畫面本身：一台在路上的機器，還有它壓平路面的動作。後面所有比喻用法都是從這裡借畫面。
noun · B2
A heavy road vehicle with very wide, heavy rollers instead of ordinary wheels, driven slowly over a new road surface to press it flat and hard.
壓路機
核心畫面
Hold one picture and everything else follows: a very heavy machine with a huge roller on the front, moving over a road at walking speed. It never swerves and it never hurries. Whatever is under it does not get argued with — it gets flat. That is the whole word. Put the machine on a person and you get someone nobody can stop; put it on a meeting and you get a plan that is through before the questions start; put it on a match and you get a score with only one side in it.
可以想成一台很重的機器，前面一個大滾筒，用走路的速度壓過路面。它不轉彎，也不趕時間。壓在它下面的東西，不會有人跟你商…更多收起
可以想成一台很重的機器，前面一個大滾筒，用走路的速度壓過路面。它不轉彎，也不趕時間。壓在它下面的東西，不會有人跟你商量——就是變平。這個字全部的用法都從這台機器出發：把它放到人身上，就是一個擋不住的人；放到會議上，就是問題還沒問完案子就過了；放到比賽上，就是比分完全一面倒。From the word’s history
steam + roller: a roller driven by steam. The engines changed, the name stayed.
steam（蒸汽）＋ roller（滾輪），也就是靠蒸汽推動的滾筒機器。後來動力換了，名字留下來了。
packet evidence: Wiktionary etymology for steamroller (kaikki:3f6f69a190036ae4), 'From steam + roller'
Two branches
像壓路機的人和作法
同一台機器，只是壓的東西換成了人的意見、會議的程序，或比賽的對手。畫面裡「不商量、不停下來」這個部分被整個借過去了。
verb · C1
To make something happen by using all your power and influence, so that the people who object cannot stop it; also, to beat opponents so completely that they never get going.
強行通過；輾壓