constrain

记忆“constrain”的简单方法是将它与“con”和“strain”结合起来。想象“con”代表约束的力量，而“strain”如同拉伸的绳子，越拉越紧，因此“constrain”就是比喻性地用这种拉紧或束缚的方式来限制或约束某人或某事。

constrain 限制，强迫

con-, 强调。-str, 拉长，拉紧，词源同strict,strain.

constrain

constrain: see strain

constrain (v.)

early 14c., constreyen, from stem of Old French constreindre (Modern French contraindre) "restrain, control," from Latin constringere "to bind together, tie tightly, fetter, shackle, chain," from com- "together" (see com-) + stringere "to draw tight" (see strain (v.)). Related: Constrained; constraining.

1. The police used horses to constrain the crowd from violence.

警察骑着马阻止那群人诉诸暴力.

2. It's the capacity of those roads which is going to constrain the amount of travel by car that can take place.

制约驾车出行量的将会是那些道路的通行能力。

3. If they can, constrain him to belong to their desperate odd - fellow society.

要是可能, 还要强迫他参加他们无可救药的畸形社会.

4. As with dragging, a meta - key is often used to constrain the direction of a resize interaction.

和拖动一样, 元键在这里也可以用来约束调整尺寸操作的方向.

5. A strong magnetic field can constrain electrons to move only along the field lines.

强磁场可约束电子使之只能沿着场力线运动.

【constrain, force, compel, oblige】
这组词都有“迫使”的意思，其区别是：
constrain: 侧重施加约束力或有约束作用的影响，也指环境对人强加的影响迫使人去做某事，尤指受良心、情感等内在力量驱使去做某事。
force: 指用个人意志、权力、权威或暴力等，迫使他人改变看法或做本不愿做的事。
compel: 指在法律、权力、力量或行动等的驱使下被迫而为。
oblige: 指由于生理上或道德上的需要，促使某人做某事，也指有权威的人或机构迫使某人做某事，还可指在特定情况下被迫作出的反应。

【constrain, refrain, restrain】
constrain: v.强迫，力劝，是及物动词。
• A law constrains the government from spending more money than it takes in. 法律限制政府开支大于收入。
refrain: v.抑制，禁止，强调抑制一种冲动，是正式用语，为不及物动词，后接介词from。
• Students refrain from smoking in the classroom. 学生们克制住不在教师抽烟。
restrain: v.抑制，约束，指通过管束阻止某事发生，是及物动词，其习惯用法是restrain sb. (sth.) from doing。
• She restrains her dog by walking him on a leash. 溜狗时，她牵着狗来限制它的活动。