In southwestern China, karst region centered on Guizhou Province is the vastest one in the world and is overlain by non-isopachous red earth.
以贵州为中心的中国西南岩溶区是世界上连片分布面积最大的岩溶区，其上分布着厚度不一的红色土层。
The feet of the marking device are two aequilate and isopachous straight stripe feet, and the evenly divided scale and the ruler scale are engraved on the feet.
划线规的脚为等宽、等厚的两直条脚，并刻有等分刻度及直尺刻度。
In this paper, equations of the isopachous profile curve and the cycloid profile curve were derived in detail, and the reasonable choice range about parameters of cycloid profile curve is determined.
本文详细推导了等距型面曲线方程和旋轮线（摆线）型面曲线方程，并确定了旋轮线型面曲线方程参数的合理选择范围。
In this paper, it clarifies the principle of shaping isopachous trihedral-hole with the inner equidistant line as the edge of the shaper cutter, and indicates many factors that should be considered when determining average radius of shaper cutter.
本文阐明了以内等距线为插刀切削刃插削等厚形三面孔的原理，指出了确定插刀平均半径时应考虑的诸因素。