同时，森林通过不断更新木材数量为人类活动提供天然原料。
At the same time, forests provide raw materials for human activities through their constantly renewed production of wood.
那就是有机滋润型肥皂和沐浴露使用纯天然原料的原因。
That is why organic moisturizing soap or shower gel uses fully natural ingredients.
这件羽毛被全由天然原料制作。
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