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ȻҪϵ֪RȫĻDzܵ҂ľǏ ȡP֪R@rӛPӛ׃҂Qи ԇPI@Ҳи ώڽ̌WЏ{ӛPӛҪԵԭoՓ뱣15ֵĿ߀_30ֵĿֻҪҪʴ_İи µ挍xPӛɲ
ӛPӛT̎Ԏ㼯ע߀Լӏ̕rӛԎ ϵļλcǣǷذlFԼһmȻ µĕr^βӛ˺ܶPӛsΨ]ӛc?}rlFԼȻԼĹPӛ?ֻһӛPӛ© ܶ༚º Լ߉Ҳy?
ôבԓЧӛ Pӛ?СVĂɲ֪и ӛPӛļɣ
һ ԒӛPI~
vӛи Pӛķrώһһ_ʼ͕V㣺ӛPI~ļ^PI~һָһЩҪČ~f~~~ͷ~Ȼ@Ҫעǣ҂Ҫ @ӣȻͬסĂ~@ҪϢ@ĿPI~}rؑӡ
eČԒWώԃӌώٵfһBҊ@ͺܿܳx}@r҂ҪڹPӛwFеҊô҂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~Rԓ@ӣworried?No. stu?how?plan?
ӛ䛾߉Pϵ~׳c
߉BһƪµĽ}jÿһƪи ¶֔Ӵκ߉Pϵ֮gҊ߉PϵD혳Сe߉ͨ^߉~߉ZwFһF߉~ͺܸܿc ߉~Ѹӛ܉ʹȲPϵһĿȻӛ̖ ߉~ ≠ different, unlike, contradict, rather than <> belong to, be part of due to, because, reason ∧ but, however, yet, in fact, actually, while ӛ̖ ߉~ ≠ different, unlike, contradict, rather than <> belong to, be part of due to, because, reason ∧ but, however, yet, in fact, actually, while
ٴѴõ߉R܉ճҊ߉~ԼZ@ӟoՓڜyԇx Zֵĕrһ܉ƽr Ӗע⿂Y@Щ߉~ͶZ÷\ԼĿZ֣͌һ܉M߷֙n
ĄemYcӛҪϢ
ŴͬW@ӵw҂ µ^ һ̫Ć~ӕr˼Sͣ@~ϣͬr© ˽ϢȻ^ŰlFѽ֪făȥ
䌍и ԇУFҪϢƧĆ~ĕrvԒ߽^r¶ԽǷͽ@Ϣ~҂Ҫľ ~ĕrסě_ӣӲ^Ƥ ~Ľ֮ڹPӛӛҪϢ҂Ҫעи зͳFጵϢһҪϢOпǿcҲҪ҂cӛPӛĵط
СoeһӡֱܷĶfˎׂҪϢ?
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䌍ֻ_ҪϢҲfw{ֻc
䌍e@@ôL䌍ֻ_ҪϢҲfw{ֻcIJֶnjcĽ
һϢ@̫ꖵ܉ǙEAεԭ5Ԓͽ@ϢmȻFƧĆ~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׃@5ԒͽгFһЩyȵĆ~consistentҷֹЩJR@~}ֿĵĽo@FЕr@܉ΠAcЕrEAcEAcĕrӽ̫ꖡ@fľ҂ЌW֪RеĽc@
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㲻֪@Ҫc߀˷
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 ϢĕrҪ¸҈ԛQ^m ˼SҪͬrfԒ^ܳFԼ˼S
˽и v}·ДŲy
и vֵ·кҎԵһf֞6E
һϹn
ڶ~(@n})
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IJͨ^eķʽ߽B̵ķʽU}ľw
岽v^дWᆖώԼᆖ֮o (ÿᆖ̎ܿǿc)
}MпYA(ᵽv}^ȥδaӰ푻hx)
˽и vֵ·ҪƽrĹPӛӖ^Rذ Ϣw{M@·@܉õذ½Y܉_] ÿһϢҲ}ľ
Ոӛסڂ俼и ^Pӛľͨ ߷ֻMֱؽĘϣ܉мwfķN\õСףÿһȡÝMijɿҼ!