分区线 meaning in English

section line
zone line

In the aspect of waterway plane triangle - net , waterway division is used to accelerate the producing speed of plane triangle - net , and a new method of division is presented . some discrete points are added in division lines , so the plane triangle - nets have same borderlines and the difficulty of waterway division is solved . the triangle - net is suitable for the request and the producing speed of plane triangle - net increases markedly
在航道平面三角网生成方面，提出以航道分区来加快平面三角网的生成速度，并给出了一种新的航道分区办法，即在分区线上插补一定数量的离散点，使得各分区三角网在分区线上具有相同的直线边界，有效地解决了航道分区的难点，生成的平面三角网符合要求，而且其生成速度得到了很大的提高。