Scientists defined the boundary as the points where the flows of galaxies diverge, like water dividing at a watershed.
科学家将边界定义为星系流分叉的点，就像水在分水岭处分开一样。
Water divide
原声例句
自然杂志：天文学
高级英语1 第三版
The great billowing clouds that sail upon it are shadows that move upon the grain like water, dividing light.
在它上面航行的巨大的滚滚云彩是影子， 像水一样在谷物上移动，分割光线。
12 2 Kings 配乐圣经剧场版-NIV
Elijah took his cloak, rolled it up and struck the water with it. The water divided to the right and to the left, and the two of them crossed over on dry ground.
以利亚将自己的外衣卷起来，用以打水，水就左右分开，二人走干地而过。
中文百科
分水岭 Drainage divide
（重定向自Water divide）
分水岭（英语：drainage divide），是河流流域边缘较高之地可连成线，以与相邻流域相分隔，又称为「分水线」。它不但是自然地理上的界线，而且也常是政治地理上的分界。有时也引申为转折点。
英语百科
Drainage divide 分水岭
（重定向自Water divide）
A drainage divide, water divide, divide, ridgeline, watershed, water parting, or (in Canada) height of land, is the line that separates neighbouring drainage basins. In hilly country, the divide lies along topographical ridges, and may be in the form of a single range of hills or mountains, known as a dividing range. In flat country—especially where the ground is marshy—the divide may be harder to discern.