只有交换各方都感觉对自己有利时交换才能成功。
Only when both parties think its beneficial to them does the exchange succeed.
历史证明国家间的交流对各方都有利。
Historic experience shows that exchanges among countries are beneficial to all the countries concerned.
根本无法说服中国相信制裁升级对各方都有利。
China is not at all convinced that an escalation of sanctions would help either.
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