1 N-PLURAL 河段;流域;(上、中或下)游 The upper, middle, or lower reaches of a river are parts of a river. The upper reaches are nearer to the river's source and the lower reaches are nearer to the sea into which it flows. 河段;流域;(上、中或下)游
2 N-PLURAL (外)围;(远)处 You can refer to the distant or outer parts of a place or area as the far, farthest, or outer reaches. (外)围;(远)处 [formal]
3 N-PLURAL (组织或机构中的)层级 You can refer to the higher or lower levels of an organization as its upper or lower reaches. (组织或机构中的)层级 [formal]
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