Alca american leather chemists ' association 美国皮革化学家协会
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Nasa and the associated landscape contractors of america ( alca ) have announced the findings of a 2 ? year study that suggest the common indoor plant may provide a natural way of helping combat “ sick building syndrome 美国国家航空航天局和美国园林产业联合会发布了他们研究两年后的发现：普通室内植物可能提供一种帮助防治“大楼综合症”的自然方式。
