The wall is built of alternating sections of stone and earth, with some sections reaching a height of up to 4 meters.

这堵城墙是用石头和泥土交替建造而成，有些路段达到了4米的高度。

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The pipeline bridge is built up with triangle sections, its shear stiffness can be derived from the stress diagram for the truss with triangle section.

在管道跨越工程中，常用三角形截面组合管拱，由三角形截面桁梁的受力分析图，分析推导出其抗剪刚度。

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One of the world's biggest cranes, with a 500-foot boom, will sit between the two big foundation holes, pluck the already-built sections up and drop them into place.

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