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| English | Chinese |
| family of mutually parallel lines | 平行线族 |
| mutually inclined rolls | 相互倾斜的轧辊 (A solid rod of hot steel is spun between two mutually inclined rolls which rotate in the same direction, so that the rod is pulled forward between them, and passes over the mandrel. 将一根高温实心钢棒在两个相互倾斜、旋转方向相同的轧辊之间旋转，钢棒在两辊之间受拉向前，沿芯棒周围通过。) |
| mutually insoluble | 互不溶解的 |