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UNIT 9 HUMAN BIOLOGY(一)
1．Another one named Tetra was produced in the late 1990s by embryo(胚胎)splitting，the
division(n.分裂；分歧) of an early-stage embryo into two or four separate cells to make clones.
2．By contrast(相比之下)，they were each made by replacing(vt.接替；取代；更换) an egg
cell nucleus(原子核) with DNA from a differentiated body cell.
replace...with/by...用……替换……
replace...as...取代……而成为……
take the place of＝take one’s place代替；替代
in place of代替
3．Success came from adopting[v.采用(某种方法)] several new techniques.
4．Still，the research process proved(linking v．证明是)difficult，and many attempts(n.企图；
试图；尝试) by the team failed...
5．But what are we giving up(放弃) as handwriting loses its significance(n.重要性，重大意义)?
6．Researchers from Princeton University and the University of California conducted a series
of(一系列) studies to demonstrate(vt.说明；证明) the differences between students who wrote
out their notes and those who typed them.
7．The longhand notetakers had a stronger grasp(n.理解，领会) of the overall concept.
8．But now it seems that a researcher has figured out(弄清楚；搞明白) how auroras really make
sounds.
9．That explains how the sounds correspond with(与……相对应/一致) the aurora’s visible
movements—they begin to happen in the inversion layer only about 75 meters above the observer.
10．The project is meant to(试图去做……) contain the growing Sahara Desert and fight climate
change.
11．First proposed in 2005，the project aims to(目标在于/旨在) plant a forest from Senegal on
the Atlantic Ocean in western Africa to Eritrea，Ethiopia and Djibouti in the east.
aim to do.../at doing...旨在做……；力求达到……
be aimed at doing sth旨在；目的在于
aimless adj.漫无目的的
aimlessly adv.漫无目的地
