在历史上，纺织染料是由植物和动物排泄物等天然资源制成的。
Historically, textile dyes were made from such natural sources as plants and animal excretions.
欧德询问有谁知道这里用的是哪种气体，“很天然的气体，” Schlangen的回答非常正确——这是利用人类排泄物生产的生化气体。
Oduor asked if anyone knew what type of gas was being used. "Very natural gas, " Schlangen answered correctly – biogas made from human waste.
海洋和海洋接收人类排泄物的冲击，无论是故意倾倒或透过天然径流的土地。
Thee seas and oceans receive the brunt of human waste, whether it is by deliberate dumping or by natural run-off from the land.
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