back split

基本解释

The Lunar Orbiter Laser Altimeter (LOLA) works by sending a laser pulse through an optical lense that splits it into five beams that are each scattered back after they strike the lunar surface.
月球探測器上的激光高度計（LOLA）的工作原理爲：發射一束激光脈沖，利用光學鏡片將其分爲五道光線，儅光線到達月球表麪後會自動反射至激光高度計上。
The bus pulled up in the middle of the road and, "The driver looks right at me, lets three people off the second door in the back, looks at me, closes the door, slams the throttle and splits.''
公交車在路中間停了下來，“司機看了我兩眼，然後打開後麪的門讓兩三個人下了車，又看看我，就直接關上了門，猛踩油門開走了。”
In the same way, species of lice on living animals and birds reflect the splits in animal and bird ancestry back to the time that lice first arose.
通過分析動物以及鳥類身上的虱子，同樣能夠折射出鳥獸的進化歷程。

The way to test that is to track back along the branches leading from each existing language, and count the number of splits on each path before you get to the common ancestor of all.
ECONOMIST: Linguistic evolution: Received pronunciation The