No matter where they walked, they could hear the thudding of the catapults lofting rocks.

不论走到哪儿，他们都能听到投石机的抛掷石头时发出巨响。

Firstly, the author has introduced the realization course of the digitized lofting drawing.

本文提出一种模线图形的数字化处理方法。

So, this method was useful in the ship lofting, numerical control and the drawing of engineering.

因此，此法在数学船体放样、数控加工及工程图纸的绘制中有一定的应用价值。

It's the common way to predigest the ellipse to four arcs in hand-drawing or construction lofting.

把椭圆线简化为四段圆弧，是手工作图或施工放样的常用方法。

This paper points out this can fit small and middle shipyard using computer in the tubing lofting.

验证了利用这种方法对中小船舶进行计算机辅助放样的可行性。