con·straint /kənˈstrent/
  強制,侷促
  constraint
  制約; 約束
  constraint
  約束
  Con·straint n.  The act of constraining, or the state of being constrained; that which compels to, or restrains from, action; compulsion; restraint; necessity.
     Long imprisonment and hard constraint.   --Spenser.
     Not by constraint, but by my choice, I came.   --Dryden.
  Syn: -- Compulsion; violence; necessity; urgency.
  Usage: -- Constraint, Compulsion. Constraint implies strong binding force; as, the constraint of necessity; the constraint of fear. Compulsion implies the exertion of some urgent impelling force; as, driven by compulsion. The former prevents us from acting agreeably to our wishes; the latter forces us to act contrary to our will. Compulsion is always produced by some active agent; a constraint may be laid upon us by the forms of civil society, or by other outward circumstances.
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  constraint
       n 1: the state of being physically constrained; "dogs should be
            kept under restraint" [syn: restraint]
       2: a device that retards something's motion; "the car did not
          have proper restraints fitted" [syn: restraint]
       3: the act of constraining; the threat or use of force to
          control the thoughts or behavior of others