空气的效用

fullness of time───时间充裕

usefulness───n.有用；有效性；有益

in the fullness of time───在适当时候

fullness of times───时代的充实

goodness of fit───[数]拟合优度；[统计]适合度，吻合度

useful lesson───有用的教训

The minimalist design harmoniously integrates light, shadow and textures, blending them with the usefulness of natural location as well as the heating and air conditioning system used.───简约的设计和谐地集成了光、阴影和纹理，融合与自然的位置，以及采暖和空调系统使用的用处。