High-pressure mercury lamps were more effective for exciting the photoreaction of naphthalene relative to sunlight.
实验证明,高压汞然日
更能有
激发萘的
反应。
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Northwest Europe, including the British Isles, France, the low countries, Germany and Denmark, was once completely covered in mixed forest, and these areas still have many patches of natural woodland despite extensive deforestation over millennia.
西北欧,包括不列颠群岛、法国、低地国家、德国和丹麦,曾经完全被混交林覆盖,尽管几千年来森林砍伐严重,但些地区仍然有许多天然林地。