B2 the protection of plants and animals, natural areas, and interesting and important structures and buildings, especially from the damaging effects of human activity(对动植物、自然地区、历史建筑等的)保护
C1 carefully using valuable natural substances that exist in limited amounts in order to make certain that they will be available for as long a time as possible(对自然资源等的)保护,保存,节约
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