作为初级教材摆正教材的地位，分工合理，体现可持续性学习的特色，整体呈现出螺旋式的上升结构。

Being elementary textbooks, it should be put into suitable position and fulfils its own function. It also should carry a characteristic of sustainable learning and a spiral structure.

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船员们会在公园里工作的人们，学习方面的项目包括持续性、就业、技能、考古学。

The Crew will meet people working on the Park and learn about aspects of the project including sustainability, employment and skills, and archaeology.

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第二语言的学习动机由三部分组成，即动机原因、动机强度及动机的持续性。

Second language learning (SLL) motivation consists of three components: motivation orientation, motivation intensity and motivation persistence.

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