restraint-constraint-strain-stress-strict

strain

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She was at great pains to stress the advantages of the new system.
她极力强调新制度的优点。
restraint
a rule or law that limits what you can do 指限制规定、限制法规
a rule, a fact, an idea, etc. that limits or controls what people can do  
constraint
a thing that limits or restricts sth, or your freedom to do sth
constraints of time/money/space
时间 / 资金 / 空间的限制