"These habitats are exceptionally rare, rich in biodiversity, support unique flora and fauna, and are impossible to recreate or replace," he said.
if (n <= 1) return n;
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走进廊坊经济技术开发区一家制药企业，生产车间内，干净整洁的生产线有序运转；污水处理站里，经过升级的治污设备平稳运行。
"Clearly this area needs further research to find out if it's causative or not."