醫學：開得了刀
英文的 operate 一邊是操作機器，一邊是動手術，operation 也是；所以「推得動」這個畫面到了醫院，變成「這一刀下得去」。
adjective · C1
If an illness, injury, or growth is operable, doctors are able to treat it with an operation.
可以開刀的
核心畫面
Take the word apart and the picture is there: operate plus -able, so it can be made to go. Someone could put a hand on this thing and it would move - the switch works, the steps can be followed, the surgeon can begin. What changes between the uses is only what is being set in motion: a machine, an arrangement, or an operation on a body.
「operable」可以想成 operate（開動、操作）加上 -able（做得到的），畫面就是「推得動」。有人伸手…更多收起
「operable」可以想成 operate（開動、操作）加上 -able（做得到的），畫面就是「推得動」。有人伸手去弄，它就會動起來：開關按下去有反應，步驟照著走跑得完，手術刀下得去。三個意思之間換的只是「被弄動的是什麼」。一台機器、一套安排，或是身體上的一場手術。From the word’s history
Wiktionary records it as borrowed from Latin operabilis. The same operate also gives operation, which in English covers both running a machine and performing surgery - which is why one adjective serves a railway and a tumour.
依據來源，這個字借自拉丁文 operabilis。同一個 operate 也長出 operation，而 operation 在英文裡同時是「運轉」和「手術」。所以一個形容詞才會既能講鐵路，又能講腫瘤。
Wiktionary, entry operable (packet source_ref kaikki:3f6f69a190036ae4:1460083257:8582)
From the picture
Also in this word
adjective · C1
If a machine, vehicle, or a system such as a railway or a power plant is operable, it is in working order, so it can be used.
還能運作的／可使用的
adjective · C2
If a plan, rule, or agreement is operable, it can be carried out in practice and made to work.
行得通的／可實行的