對行為的約束
繩子從情況換成人或制度：不是「條件不允許」，而是「有人規定不可以」，所以這一支帶著管束的意味。
constraint, control on behavior · noun · C2
Control that limits how people may behave, stopping them from doing whatever they want.
約束；管束
核心畫面
Picture a rope tied around what you were going to do: you can still move, just not as far. The word names that rope. Sometimes it is circumstance doing the tying — there is only so much money, only so much time — and sometimes it is people setting limits on how others may behave. Either way, something that could have been wider has been pulled in.
可以想成：你本來要做的事被一條繩子綁住——還是動得了，只是伸展不到原本那麼遠。這個字說的就是那條繩子。有時候綁住你的…更多收起
可以想成：你本來要做的事被一條繩子綁住——還是動得了，只是伸展不到原本那麼遠。這個字說的就是那條繩子。有時候綁住你的是現實條件：錢就這麼多、時間就這麼多；有時候是人設下的規範，限制別人可以怎麼做。不管哪一種，本來可以更寬的東西被收緊了。From the picture
Also in this word
constraint, limitation · noun · C1
something that limits what you are able to do, such as not having enough time, money, or space.
限制；現實條件
原始詞典資料5 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
constraintnoun/kənˈstɹeɪnt/
- 1
Something that constrains; a restriction.
- An engineer must recognize the difference between a constraint (to work within) and a problem (to be eliminated via resolution).
- Today’s electricity demand (65 EJ/a) is well covered by the range, but constraints may occur in the long run locally. Amongst large countries, Nigeria and India may need imports to meet electricity demand.
- 2
An irresistible force or compulsion.
- They confessed, but only under severe constraint.
- 3
The repression of one's feelings.
- Although his blood so rose against this man, and his wrath so stirred within him, that he could have struck him dead, he put such fierce constraint upon himself that he passed him without a word or look. Yes, and he would have gone on, and not turned, though to resist the Devil who poured such hot temptation in his brain, required an effort scarcely to be achieved, if this man had not himself summoned him to stop
- 4
mathematicssciencesA condition that a solution to an optimization problem must satisfy.
- 5
computingdatabasesengineeringA linkage or other restriction that maintains database integrity.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。