建筑物中墙、柱等结构所占的面积总和。用户不能直接享用这一部分的面积。
整个结构面积达200平方米，其中的每一部分都由漏斗状的结构支撑，由单向的树脂包层纤维组成，重量仅45千克。
Each piece of the 200-square-metre structure, which is supported by funnel-shaped legs, is formed by a single length of resin-coated fibre and weighs just 45 kilograms.
要保护好基本农田，稳定粮食播种面积，优化粮食品种结构，着力提高粮食单产。
We must protect primary farmland, keep the area sown to grain stable, improve the structure of grain varieties grown and increase the per unit area yield of grain.
这些皱褶和沟回结构大大增加了新皮层的表面积，为数十亿的神经元提供了空间。
The folds increased the surface area available for the billions of neurons in the human neo-cortex.
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