back split

基本解釋

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(cè)器上的激光高度計(jì)（LOLA）的工作原理爲(wèi)：發(fā)射一束激光脈沖，利用光學(xué)鏡片將其分爲(wèi)五道光線，儅光線到達(dá)月球表麪後會(huì)自動(dòng)反射至激光高度計(jì)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(jī)看了我兩眼，然後打開後麪的門讓兩三個(gè)人下了車，又看看我，就直接關(guān)上了門，猛踩油門開走了?！?/li>
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(dòng)物以及鳥類身上的虱子，同樣能夠折射出鳥獸的進(jìn)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