沒長到、沒做足
核心畫面用在會成長、會被做出來的東西上：身體、能力、想法、制度。
adjective · C2
Not as fully grown, formed or worked out as it should be, or as it normally is by this stage.
發育不全的；沒做足的
核心畫面
Picture a line drawn where something ought to have reached, and the thing stopping short of it. That gap is the whole word. The prefix under- puts it there, exactly as it does in undercooked and underpaid: the process happened, it simply did not go far enough. So the word never just means small or weak. It always points at a standard sitting somewhere in the sentence, and says this fell short of it.
可以想成有一條線，標著「本來應該到這裡」，而東西停在線的前面。那一段空白就是這個字的全部。前綴 under- 的作用…更多收起
可以想成有一條線，標著「本來應該到這裡」，而東西停在線的前面。那一段空白就是這個字的全部。前綴 under- 的作用就是把東西放在線的前面，跟 undercooked（沒煮熟）、underpaid（給太少）是同一招。所以它從來不只是「小」或「弱」。它一定在指句子裡某個標準，然後說「沒到」。Three branches
經濟上沒發展起來的地方
同一條線，只是這次量的是一個地方的工廠、道路和公共服務，而且這個判斷是從外面下的。
adjective · C2
Used of a country, region or area that is poor and has little modern industry.
（國家、地區）落後的、不發達的
底片顯影不足
造字的方式一模一樣，但這裡的 develop 是「沖洗顯影」，是 develop 的另一個意思，所以要當成另一條路來記。
adjective · C2
Of a photographic film or print: left in the developing liquid for too short a time, so the picture comes out too pale or too faint.
（底片、相片）顯影不足的