交界线 meaning in English

juncture

Beneath this meeting-line of light and shade nothing was visible save one solitary point of light .
在天光与暗影的交界线下，除掉一个灯光的小亮点儿以外，什么东西也看不见。
By adjacent regions we mean regions with a whole segment of boundary in common
就相邻区域来说，我们指具有完整的公共交界线的区域。
During the night camp walbach was passed on the left ; lodge pole creek ran parallel with the road , marking the boundary between the territories of wyoming and colorado
这一夜，火车从瓦尔巴营右方驰过。洛基布尔河和铁道平行，顺着怀俄明和科罗拉多两州笔直的交界线向前奔流。
By doing single fracture drainage experiments , this paper has successfully presented the logarithm function relationship between ratio of drainage discharge through upward and plumb drainage hole and the ratio of their equivalent diameters . the drainage effect will be the best when the included angle between drainage hole and fracture surface is 21 ~ 36
4 、通过单裂隙排水试验，建立了倾斜孔和垂直孔的排水量之比与其交界线的等效直径比之间的自然对数关系式，排水孔排水量基本随其与裂隙面的交角减小而增大；对单组裂隙排水的初步分析表明，排水孔与裂隙面的夹角在21 ~ 36范围内排水效果最佳。