ב(yng)ԓЧӛ Pӛ?СVĂɲ֪и ӛPӛļ!gӭx!
һfи ԇһsectionһԒ̓ɂvЌԒֵLͨ2-3ңnvtҪLһЩЩ_(d)5-6犡҂֪֣и (xing)oՓǂ俼߀yȶǷdzģ?yn) σ?ni)漰VҌI(y)ԘO(qing)@ҪHҪ֪֪ҪƼˇvʷ˽⡣
(dng)ȻҪϵ֪RȫĻDzܵģ҂ľǏ ȡP(gun)֪R@rӛPӛ׃҂Qи ԇP(gun)I@Ҳи ώڽ̌W(xu)Џ(qing){(dio)ӛPӛҪԵԭoՓ뱣15ֵĿ߀_30ֵĿֻҪҪ(zhn)_İи µ挍(sh)xPӛɲ
ӛPӛT̎Ԏ㼯ע߀Լӏ(qing)̕rӛԎ ϵļ(x)(ji)λc(din)Ƿذl(f)F(xin)Լ(x)һ£mȻ µĕr^βӛ˺ܶPӛsΨ(d)]ӛc(din)?}rl(f)F(xin)ԼȻԼĹPӛ?ֻһӛPӛ© ܶ༚(x)(ji)(do)º(ni) Լ߉Ҳy?
һ ԒӛP(gun)I~
vӛи Pӛķrώһһ_ʼ͕V㣺ӛP(gun)I~ļ^P(gun)I~һָһЩҪČ(sh)~f~~~ͷ~Ȼ@Ҫעǣ҂Ҫ @ȻͬסĂ~@ҪϢ@ĿP(gun)I~}rؑ
eӣČԒW(xu)ώԃӌώٵfһBҊ@ͺܿܳx}@r҂ҪڹPӛwF(xin)еҊô҂ԓӛЩ~?
Student: Do you have any advice on how I should cover the story?
Advisor: Well, Max will want to talk to you but I am sure he will tell you to find out things like why the physics department's worried about enrollment?Has the number of students been getting smaller in recent years? By how much? What kinds of plans are they considering to address this problem?
τfķ挦ԒЮֵľwҊҪӛ~R(yng)ԓ@ӣworried?No. stu?how?plan?
ӛ䛾߉P(gun)ϵ~׳c(din)
߉BһƪµĽ}j(lu)ÿһƪи ¶(yn)֔(jn)?sh)Ӵκ߉P(gun)ϵ֮gҊ߉P(gun)ϵD(zhun)혳Сe߉ͨ^߉~߉ZwF(xin)һF(xin)߉~ͺܸܿc(din)
߉~Ѹӛ܉ʹ(ni)P(gun)ϵһĿȻ
õѸӛ䛾g߉P(gun)ϵķͨ^N̖磺
Ѵңõ߉R܉ճҊ߉~ԼZ@ӟoՓڜyԇx Zֵĕrһ(yu)܉ƽr Ӗ(xn)ע⿂Y(ji)@Щ߉~ͶZ÷\(yn)ԼĿZ֣͌һ܉M(jn)߷֙n
ĄemY(ji)c(din)ӛҪϢ
Ŵ(sh)ͬW(xu)@ӵw(dng)҂ µ^ һ̫Ć~ӕr˼Sͣ@~ͬr© ˽ϢȻ^Űl(f)F(xin)ѽ(jng)֪făȥˡ
䌍(sh)и ԇ(dng)F(xin)ҪϢƧĆ~ĕrvԒ߽^r¶ԽǷ(f)@Ϣ~҂Ҫľ ~ĕrסě_Ӳ^Ƥ ~Ľ֮ڹPӛӛҪϢ҂Ҫעǣи з(f)F(xin)ጵϢһҪϢOпǿc(din)ҲҪ҂c(din)ӛPӛĵط
ώoeһֱܷĶfˎׂҪϢ?
Ok, a lot of people think of earth’s orbit around the sun as being perfectly circular, as smooth and as regular as, say, the way that hands move on a well-made watch, but it just doesn’t work that way. You are probably aware that the earth’s orbit around the sun, it is not shaped like a perfect circle. It is more of an oval, it is elliptical. But the shape of this orbit isn’t consistent; it varies over time, over a period of about a thousand years. Sometimes it is a little more circular, sometimes it is more elliptical. And when earth’s orbit is more elliptical, earth is actually closer to the sun during part of the year. Which makes earth, and in particular, the northern hemisphere, warmer. And why is that important? Well, because most of the planet’s glaciers are in the northern hemisphere, and if it gets too warm, then glaciers will stop forming. And we’ve already talked about how that affects earth’s overall temperature.
䌍(sh)e@@ôL䌍(sh)ֻ_(d)ҪϢҲfw{ֻc(din)IJֶnjc(din)Ľ
һϢ@̫ꖵ܉ǙEAεԭ5Ԓ(f)@ϢmȻF(xin)ƧĆ~oval}¿ һ^Ҋelliptical£
Ok, a lot of people think of earth’s orbit around the sun as being perfectly circular, as smooth and as regular as, say, the way that hands move on a well-made watch, but it just doesn’t work that way. You are probably aware that the earth’s orbit around the sun, it is not shaped like a perfect circle. It is more of an oval, it is elliptical.
ڶϢ@܉Π׃@5Ԓ(f)гF(xin)һЩyȵĆ~consistentҷֹЩJ(rn)R@~}ֿĵĽo@F(xin)Еr@܉ΠAc(din)ЕrEAc(din)EAc(din)ĕrӽ̫@fľ҂ЌW(xu)֪RеĽc(din)@
But the shape of this orbit isn’t consistent; it varies over time, over a period of about a thousand years. Sometimes it is a little more circular, sometimes it is more elliptical. And when earth’s orbit is more elliptical, earth is actually closer to the sun during part of the year.
ϢΠ׃Ӱ푵ϱγfԒһ5Ԓ@Ϣ㲻֪@Ҫc(din)߀˷
Which makes earth, and in particular, the northern hemisphere, warmer. And why is that important? Well, because most of the planet’s glaciers are in the northern hemisphere, and if it gets too warm, then glaciers will stop forming. And we’ve already talked about how that affects earth’s overall temperature.
mȻ @ô~R;䌍(sh)ĹPӛҪӛֻ@ҪϢɴ˿֪ETSһԻĵĽM(dng) ϢĕrҪ¸҈ԛQ^m(x) ˼SҪͬrfԒ^ܳF(xin)Լ˼S
˽и v}·Д(sh)Ųy
и vֵ·к(qing)Ҏ(gu)Եģһf֞6E
һϹ(ji)n(ni)
ڶ~(@(ji)n})
B@~(һNF(xin)vʷ¼)
IJͨ^eķʽ߽B̵ķʽU}ľw(ni)
岽v^дW(xu)ᆖώԼᆖ֮o (ÿᆖ̎ܿǿc(din))
}M(jn)пY(ji)A(ᵽv}^ȥδa(chn)Ӱ푻h(yun)x)
(dng)˽и vֵ·ҪƽrĹPӛӖ(xn)^Rذ Ϣw{M(jn)@·@܉õذ½Y(ji)(gu)܉_(d)?jng)] ÿһϢҲ}ľ