认识环境的变化，可关键在预防滑坡惨剧。
An awareness of changes in the environment can be critical in preventing landslide tragedy.
认识环境问题的文化群体认同因素，要回归到各社会群体的相互联系上来。
To understand the cultural group identity, we have to analyze relations in different social groups.
通过测定曝气池中的环境因素和观察活性污泥状态，认识环境因素对微生物生长的影响。
Knowing about the effect of environment variation in aerator on microorganism growth by detecting environment factors and observing activated sludge.
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