Clothing is one kind of human life conditions, among which color is the essential factor.
服装是人类各种生活状态中的一种，色彩是这种状态的一个必不可少的要素。
In the wetland park, plant is the sole essential factor of landscape design which has the life.
植物是湿地公园中唯一有生命的园林造景要素。
Speed has become the essential factor of success in all walks of life.
速度已成为各行各业成功的要素。
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