原文视听

Sven is only this slim
斯文保持如此的身材
because of enormous efforts
是因为他的家庭与医生
on the part of his family and his doctor.
付出了巨大的努力
What happened was that the operation to remove the tumour
肿瘤摘除手术
somehow damaged his hypothalamus,
伤害到了他的下丘脑
an important nerve centre in the brain.
一个大脑中重要的神经中枢
Damage to his hypothalamus is
他的饮食习惯
what changed his eating behaviour.
因下丘脑的破坏而改变
Actually, we know that patients who have this tumour,
实际上 有这种肿瘤的病人
they don't die because of the tumour.
通常不会死于这种肿瘤
Most of them die because of the overweight that they develop.
而是死于由此引发的肥胖问题
Something in Sven's hypothalamus had to be keeping him hungry.
斯文下丘脑中的某些物质让他一直饥饿
Scientists knew that the hypothalamus
科学家知道 下丘脑
was involved in switching the appetite on and off.
与调控食欲有关
But decades of research had
但是几十年的研究并没有
brought them no closer to knowing exactly how.
让他们得知具体的调节原理
Then along came a big fat clue.
接下来的事 为此提供了重要线索
From the day it was born, this mouse had never stopped eating.
从出生那天起 这只老鼠从未停止进食
Researchers spent ten years
科学家花了十年的时间来
comparing this mutant mouse with other thin mice.
将这只基因突变的老鼠和其它瘦老鼠对比
And unexpectedly, they found
出乎意料地 他们在
the answer in the fat cells of the thin mouse.
瘦老鼠的脂肪细胞中找到了答案

重点解释

they don't die because of the tumour.通常不会死于这种肿瘤

because of:因为； 由于

The game was cancelled because of the rain.

比赛因为下雨而取消了。

Scientists knew that the hypothalamus was involved in switching the appetite on and off.科学家知道下丘脑与调控食欲有关

involve in:卷入； 陷入

I got involved in a quarrel about the price.

我被卷入了一场有关价格的争吵。

switch on:(用开关)开启

The video is programmed to switch on at ten o'clock.

电视机设定在10点钟自动打开。

switch off:(用开关)关掉

Do you mind if I switch the radio off?

我可以关掉收音机吗？

Researchers spent ten years comparing this mutant mouse with other thin mice.科学家花了十年的时间来将这只基因突变的老鼠和其它瘦老鼠对比

compare with:与 ... 相比

Compare with those who is suffering, we are better off.

跟那些受苦的人相比，我们过得很好了。

How does your bike compare with mine?

你的自行车怎么能和我的自行车相比呢?