The hardest thing to build is a plain straight wall. The dimensions must be absolute.
最难砌的是一堵简朴笔直的墙，尺寸必须一丝不差。
Free-flow tunnel used more round arch straight wall form cross-section.
无压隧洞多采用圆拱直墙形断面。
By taking a duct of an aircraft as an example, ultra long and ultra thin al alloy straight wall special-shaped part machining process is analyzed and discussed.
以某飞行器风道零件为例，对超长超薄铝合金直壁异形件的加工进行了工艺分析和探讨。
Then an idea was proposed for the raise of the forming height of straight wall components and the effect was proved in the experiment.
就提高成形直壁件的高度提出了改进意见，并在试验中得到证实。
However, the taller straight-wall parts can not be produced directly, which is the most difficult problem to be resolved.
在金属薄板直壁件的成形中，最难解决的问题是无法直接成形出较高的直壁。
However, the taller straight-wall parts can not be produced directly, which is the most difficult problem to be resolved.
在金属薄板直壁件的成形中，最难解决的问题是无法直接成形出较高的直壁。
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