иx俼ĽǶȁvҪB(yng)һNXǰLƪӢµĸXƽrпյĕrͿԿȥI@ӵһNh(hun)xIBTζ횺XIBT4ԇ(ni)ݶXǰɵxȻ⡣
LJ(ni)ܶWǛ]LXǰxӢµTͭh(hun)ҪIƽrӢZľW(wng)վLƪČWg@]ׂeľW(wng)վă(ni)ݺиx}P֮̎@ЩW(wng)վnational geographic, economist, new scientist, wikipedia
W(wng)վӢֻƽrһNgӜʂҪ(zhn)߀ҪиӾwһЩEhҪׂȥʂ䡣
һc~RAҪиxһܴɫЌT~}Ҳ~R}гһ~oĂxxc@~~xӽϵ@Щ~RǛ]һVȥģֻпƽrԼ~ReһЩWgWƵ~R
P(ni)ݵĎ״ǵγɺǵ|(zh)ʲô(ni)~Rȵ~R}ռı߀dz֮һƪx13}Ŀп3-5}~R}QҪIBTԇһҪȥ~Ԓ}WƱҪȏAZҪЧĶ
ڶcZ֪RҪ˽⡣иxԇһ헱^ȫĿWӢZă(ni)ݣԏ~R_ʼһֱѽ(jng)ƪ¶ЌĿ}ȥҪӵĺx~RJRҲһȫеĕrҪͨ^Z֪Rȥ@NZںܶ}wF(xin)ָ}Ҫ~ָ~ĂЕrҪͨ^^eɷֵķҵ
c߉Pϵ~ҪӛӢZӵܶrҪȥ߉PϵҊ߉Pϵв(and, as well)^(than, as….as)(because, so, therefore, thus, resultfrom)fM(also, furthermore)D(zhun)(but,however, yet)ȵȡӃ(ni)@Щ߉PϵӺ;֮gҲ@Щ߉Pϵ@Ӳƪµ}jȥӺ@}͡
cxҪӏиxԇÿƪĕrgҎ(gu)20˿Lƪ߀1113}Ŀă(ni)ݣԕrgǷdzoxĕrٶȾͺPIѿҪĵһЩxĉTxxָxȣ@ӵTֻxٶԿxڿԇǷdzҪxĕrҪȺ
cעؚw{B(yng)иxһ}ȫ˼Ěw{Aɵsummaryľǿµw˿ƽrĕrһҪע⌦¶Ěw{܉^̵ĕrg(ni)¶ĴxȻMпY(ji)xܴĺxă(ni)ݡƽrעؚw{B(yng)ôԇĕrͲúsummary@Nw{Ե}