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(中文) 2-3用沉的材料造船
(中文) 2-4增加船的載重量
(中文) 2-5給船裝上動(dòng)力
3.1地球——宇宙的奇跡
(中文) 3-2我們面臨的環(huán)境問題
(中文) 3-3珍惜水資源
(中文) 3-4解決垃圾問題
(中文) 3-5合理利用能源
(中文) 3-6讓資源再生
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