系统组成一个统一完整的，服务一个共同目ii的一组项目。

A system is a group of items forming a unified whole, serving a common purpose ii.

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他们曾密切合作，共同规划这一项目。

They had cooperated closely in the planning of the project.

《牛津词典》

研究小组成员约尔根·舒米茨说：“我认为这是证明迁徙去澳洲的有袋目动物和其他大陆的有袋目动物有共同祖先这一理论的一个有力的证据。”

"I think this is pretty strong evidence now for the hypothesis of a single migration [to Australia] and a common ancestor, " said Juergen Schmitz, one of the research team.

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