应加强南南合作，形成对南北合作的有益补充。
They should encourage South-South cooperation as a useful supplement to North-South cooperation.
我希望这个英语培训能成为大家课堂英语学习的一个有益补充。
I do hope this English training can become a helpful supplement for your English learning in class.
其他组织和机制也可以提供有益补充，促进执法等领域务实合作。
Other organizations and mechanisms can also play a useful, complementary role and promote practical cooperation in law-enforcement and other fields.
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