当然，他们是西半球的第一批人吗？
Of course, were they the first people in the Western hemisphere?
每个半球又进一步分化为四个区域或叶。
It is further divided into four regions, or lobes, in each hemisphere.
这使得地球变暖了，尤其是北半球地区。
Which makes earth, and in particular, the northern hemisphere, warmer.
在南半球，冬天已经开始，赤道以北是夏天。
In the Southern hemisphere winter has begun, and it is summer north of the equator.
大脑半球轮流进入以慢脑波为特征的睡眠阶段。
The brain hemispheres take turns sinking into the sleep stage characterized by slow brain waves.
枫树等树木越往北半球的北边走，通常就越红。
Trees such as maples usually get much redder the more north you travel in the northern hemisphere.
随着北半球秋季的临近，太阳能的可用量大幅下降。
As fall approaches in the northern hemisphere, the amount of solar energy available declines considerably.
尽管北半球的燃料消耗更大，但那里的气温似乎正在下降。
Although the fuel consumption is greater in the northern hemisphere, temperatures there seem to be falling.
海豚，还有其他一些海洋动物，它们睡眠时会关闭大脑的一个半球。
Dolphins, as well as other marine animals, shut down one hemisphere of the brain when they go to sleep.
你们中惯用右手的人，也就是十分之九的人，语言功能位于左半球。
Those of you who are right-handed, which comprises about nine out of ten people, have language in your left hemisphere.
虽然南半球也见证着类似的融冰影响，但是格陵兰冰盖可能特别脆弱。
While similar melting effects are being measured in the southern hemisphere, the Greenland sheet may be uniquely vulnerable.
因为地球上大部分的冰川都在北半球，如果温度过高，冰川就会停止形成。
Because most of the planet's glaciers are in the northern hemisphere, and if it gets too warm, then glaciers will stop forming.
预测信号是大脑右半球发出的稳定节奏阿尔法波，与放松身心的活动密切相关。
The predictive signal is a steady rhythm of alpha waves emanating from the brain's right hemisphere, which are closely associated with relaxing activities.
如果大脑有足够冗余，即使你的右半球被破坏了，你的左半球仍然有相同的记忆。
If there's enough redundancy in the brain so that even if your right hemisphere got destroyed, your left hemisphere still has all the same memories.
我们很快就会知道，600年前北半球大部分地区每年夏季和冬季的温度是如何变化的。
We are close to a knowledge of annual summer and winter temperature variations over much of the northern hemisphere going back 600 years.
因为语言中心更小，而且只位于一个半球，这就使男性更容易出现语言障碍，如诵读困难。
Because language centers are smaller, and only located in one hemisphere, this puts males more at risk for language disorders like dyslexia.
与向志愿者的左耳播放噪音相比，向他们的右耳播放噪音（刺激大脑左半球）更有可能唤醒他们。
Playing sounds into the right ears (stimulating the left hemisphere) of volunteers was more likely to wake them up than if the noises were played into their left ear.
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