動詞 constrain:

1. hold back
   同義詞：restrain, encumber, cumber, constrain
2. restrict
   同義詞：stiffen, tighten, tighten up, constrain

形容詞 constrained:

1. lacking spontaneity; not natural
   同義詞：forced, strained

1. A life that had been constrained by habit to the same few activities and friends.
   習慣于被束縛在一成不變的幾個活動和朋友中的生活
2. I feel constrained to write (ie I feel I must write) and complain in the strongest possible terms.
   我深感責無旁貸，必須筆誅墨伐。
3. As an artist he didn't consider himself constrained (ie restricted) by the same rules of social conduct as other people.
   他認為自己是藝術家，不必像一般人那樣要受社會行為準則的束縛。
4. I felt constrained to do what he told me.
   我覺得不能不做他叫我做的事。