As a poet, Ted Hughes had an acute sensitivity to the way in which constraints on self-expression, like the disciplines of metre and rhyme (韻律), spur creative thought
出自-2013年12月閱讀原文
Compared with a hundred years ago, our lives are less tightly bound by social norms and physical constraints
出自-2013年12月閱讀原文
And scientists are only just beginning to understand what those constraints are.
2018年6月六級真題（第一套）閱讀 Section C
柯林斯高階英漢雙解學(xué)習(xí)詞典釋義
N-COUNT
限制;束縛;約束
A constraint is something that limits or controls what you can do.