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1、significant
重要的；有意义的；
The learner's attention needs to be directed to the significant features.
需要将学习者的注意力引向那些着重点上。
2、substantial
大量的；结实的；
Substantial numbers of rank and file members ignored their union's advice.
有相当一部分普通员工不理睬工会的建议。
The West must back up its verbal support with substantial economic aid.
西方国家必须以切实的经济援助来兑现他们的口头支持。
