8.可替代燃料alternative fuel

9.可持续性发展sustainable development

10.科学探索scientific exploration

11.可笑的ridiculous

12.荒唐的absurd

13.取代substitute

14.overcome difficulties 克服困难

1. 可持续性发展sustainable development

2. 科学探索scientific exploration

3. 取代substitute

Understanding of sustainable development involves pupils considering the interaction between economic, social and environmental systems.

对可持续发展的理解要求学生考虑经济、社会和环境体系之间的互动。

Lunar gravity field and related studies are important aspects of lunar scientific exploration.

月球重力场研究及相关应用是月球科学探测中的重要内容之一。

In modern industry, plastics is often used as a substitute for steel.

在现代工业中，常常用塑料做钢的代用品。