If you feel constrained to do something, you feel that you must do it, even when you would rather not. Manners, a rule, a job, or other people’s eyes are pressing you. “She felt constrained to apologise” means she felt she had no decent choice but to say sorry.

If you feel constrained to do something如果你 feel constrained 去做某件事， you feel that you must do it, even when you would rather not意思是你覺得非做不可，就算你其實不想。 Manners, a rule, a job, or other people's eyes are pressing you禮貌、規定、工作，或別人的眼光在逼著你。 "She felt constrained to apologise" means she felt she had no decent choice but to say sorry"She felt constrained to apologise" 意思是她覺得除了道歉沒有更好的選擇。

It is rather formal, and a little old-fashioned; in everyday talk people usually say “I felt I had to” or “I had no choice.” You will still meet it in books and careful writing.

It is rather formal, and a little old-fashioned這個字算滿正式，也有點老派， in everyday talk people usually say "I felt I had to" or "I had no choice."日常對話裡大家通常會說 "I felt I had to" 或 "I had no choice"， You will still meet it in books and careful writing但你還是會在書本和講究的文章裡遇到它。

The same word can describe a manner that does not feel free: a constrained smile looks tight, as if the person is holding something in. The feeling underneath is similar — you are not acting from a fully open heart.

The same word can describe a manner that does not feel free這個字也可以形容一種不自在的樣子： a constrained smile looks tight, as if the person is holding something ina constrained smile 看起來很僵硬，好像這個人在忍著什麼。 The feeling underneath is similar底下的感覺是類似的， you are not acting from a fully open heart你不是完全敞開心胸在做這件事。

Constrained is the -ed form of constrain, “to limit or force.”

Constrained is the -ed form of constrainconstrained 是 constrain 的過去分詞形， "to limit or force."意思是「限制或強迫」。