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W(xu)W(wng) > иԇ > пи Pӛ

пи Pӛ

l(f)rg:2017-05-26݋f

ב(yng)ԓЧӛ Pӛ?СVĂɲ֪и ӛPӛļ!gӭx!

һfи ԇһsectionһԒ̓ɂvЌԒֵLͨ2-3nvtҪLһЩЩ_(d)5-6҂֪и 헟oՓǂ俼߀֣yȶǷdz σ(ni)漰VҌI(y)ԘO(qing)@ҪHҪ֪֪ҪƼˇvʷ˽

(dng)ȻҪϵ֪RȫĻDzܵ҂ľǏ ȡP(gun)֪R@rӛPӛ׃҂Qи ԇP(gun)I@Ҳи ώڽ̌W(xu)Џ(qing){(dio)ӛPӛҪԵԭ򡣟oՓ뱣15ֵĿ߀_30ֵĿֻҪҪ(zhn)_İи µ挍xPӛɲ

ӛPӛT̎Ԏ㼯ע߀Լӏ(qing)̕rӛԎ ϵļ(x)(ji)λc(din)Ƿذl(f)F(xin)Լ(x)һmȻ µĕr^βӛ˺ܶPӛsΨ(d)]ӛc(din)?}rl(f)F(xin)ԼȻԼĹPӛ?ֻһӛPӛ© ܶ༚(x)(ji)(do)ºƒ(ni) Լ߉݋Ҳy?

һ ԒӛP(gun)I~

vӛи Pӛķrώһһ_ʼ͕V㣺ӛP(gun)I~ļ^P(gun)I~һָһЩҪČ~f~~~ͷ~Ȼ@Ҫעǣ҂Ҫ @Ȼͬ׽סĂ~@ҪϢ@ĿP(gun)I~}rؑ

eČԒW(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߉݋P(gun)ϵ~׳c(din)

߉݋BһƪµĽ}j(lu)ÿһƪи ¶(yn)֔(jn)?sh)ŒӴκ߉݋P(gun)ϵ֮gҊ߉݋P(gun)ϵD(zhun)혳Сe߉݋ͨ^߉݋~߉݋ZwF(xin)һF(xin)߉݋~ͺܸܿc(din)

 ߉݋~Ѹӛ܉ʹƒ(ni)P(gun)ϵһĿȻ

õѸӛ䛾g߉݋P(gun)ϵķͨ^N̖磺

Ѵõ߉݋R܉ճҊ߉݋~ԼZ@ӟoՓڜyԇx Zֵĕrһ(yu)܉ƽr Ӗ(xn)ע⿂Y(ji)@Щ߉݋~ͶZ÷\(yn)ԼĿZ͌һ܉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)֪făȥ

䌍и ԇ(dng)F(xin)ҪϢƧĆ~ĕrvԒ߽^󲿷r¶ԽጣǷ(f)@Ϣ~҂Ҫľ ~ĕrסě_Ӳ^Ƥ  ~Ľ֮ڹPӛӛҪϢ҂Ҫעи з(f)F(xin)ጵϢһҪϢOпǿc(din)ҲҪ҂c(din)ӛPӛĵط

ώoeһӡֱܷĶfˎׂҪϢ?

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e@@ôL䌍ֻ_(d)ҪϢҲfw{ֻc(din)IJֶnjc(din)Ľ

һϢ@̫ꖵ܉ǙEAεġԭ5Ԓ(f)@ϢmȻF(xin)ƧĆ~oval}¿ һ^Ҋellipticalጡ£

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)ጣгF(xin)һ΢ЩyȵĆ~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ĹPӛҪӛֻ@ҪϢɴ˿֪ETSһԻĵĽM(dng) ϢĕrҪ¸҈ԛQ^m(x) ˼SҪͬrfԒ^ܳF(xin)Լ˼S

˽и v}·Д(sh)Ųy

и vֵ·к܏(qing)Ҏ(gu)Եһf֞6E

һϹ(ji)n(ni)

ڶ~(@(ji)n})

B@~(һNF(xin)vʷ¼)

IJͨ^eķʽ߽B̵ķʽU}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

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