它们是由坚固的十字形梁构成的骨架，中间夹着结实的材料，外面涂了层灰泥。
They were skeletons of strong criss-cross beams, with solid material between, coated with plaster.
之所以迅速增长，是因为大多数人都陷入了左弯的钟形曲线的中间。
The rapid growth results from the fact that the majority of the people fall into the middle of a left-skewed bell-shaped curve.
然后你能通过改变中间三角形的位置来找到最好的色阶。
Then you can find the best tone by changing the position of middle triangle.
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