Primary standard — an ambient air pollution standard designed to protect human health.
基本标准——一个旨在保护人类健康的周围空气污染级别。
Disposal of nonbiodegradable waste is a primary source of pollution.
对非生物降解物的处理是污染的主要来源。
Negative exterior influence is the primary cause of environmental pollution.
负外在效应是造成环境污染的一个重要原因。
Negative exterior influence is the primary cause of environmental pollution.
负外在效应是造成环境污染的一个重要原因。
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