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pollution indicator
food.ind., sec.sys.	污染指标
tech.	污染指示物
pollution indicator Organisms, mostly plants, which are most sensitive to slight changes in environmental factors. When identified their reaction can serve as an early warning of the endangerment of the health of a community
environ.	污染指示 (大部分植物对微小的环境因素变化都非常敏感。因此确认它们的反应也可以作为早期污染预警的指标。)

pollution indicator: 22 phrases in 3 subjects

Ecology	4
Technology	16
Water resources	2