最优聚丛原理 Optimal clumping principle

丛草原 grass heathland

灌丛草原 bush veld

灌丛干草原 shrub steppe

丛桦冻原 bushy tundra with betula exilis

原始丛林 Wildwood ; Primeval ; virgin forest

立构型原纤丛纱线 multi-fibrous yarn-like strand

人脉络丛纤维原细胞 HCPF ; Human Choroid Plexus Fibroblasts

冻原树丛 Tundra Brash