宽沟
- 【医】wide groove
宽沟-
在这个模型中，对于窄到宽结构，腐蚀前端进入宽沟道后，其形状为一条圆弧；对于宽到窄结构，腐蚀前端进入到窄沟道后，其形状仍然保持为一条直线。
In this model , for a narrow-to-wide structure , the profile of etching front is an arc when the etching proceeds into the wide channel . For a wide-to-narrow structure , the profile of etching front still keeps a straight line when the etching front reaches the narrow channel .