Helium is the by product of millennia of radioactive decay from the elements thorium and uranium.
氦是钍和铀元素数千年放射性衰变的副产品。
Once the soil has been removed by erosion, only the passage of centuries or millennia will enable new soil to form.
一旦土壤被侵蚀，新的土壤只有经过几个世纪或几千年才能形成。
Arching 275 feet and across 290 feet, Rainbow Bridge in the Utah desert has been a source of inspiration and wonderment for millennia.
拱高275英尺，跨度290英尺，犹他州沙漠里的彩虹桥一直是几千年来的灵感和奇迹的来源。
While it is unknown just how much of this is true, it is certainly known that silk cultivation has existed in China for several millennia.
虽然我们不知道这其中有多少是真实的，但可以肯定的是，丝绸栽培在中国已经存在了几千年。
Perhaps even earlier, there had emerged on the steppes of Inner Eurasia the distinctive types of pastoralism that were to dominate the region's history for several millennia.
也许更早的时候，在欧亚大陆内部的大草原上就出现了独特的游牧文化，这种文化主导了该地区几千年的历史。
If represented graphically, the curve for all these changes looks rather like that well-known hockey stick: with little change over millennia and a dramatic upswing over the past decades.
如果用图表进行展示的话，这些变化呈现出来的曲线很像大家熟悉的曲棍球杆：以往数千年都没什么变化，而在过去的几十年内却突飞猛涨。
It's every archaeologist's dream to find a lost civilization, to make some huge discovery, to find artifacts no one else has laid a hand on in millennia.
每个考古学家的梦想都是找到一个失落的文明，做出一些重大的发现，找到千年来无人触及的手工艺品。
The history of bull fighting stretches back millennia.
斗牛的历史迄今已有一千多年了。
Our cognitive biases have survived for millennia for good reason.
几千年来认知偏差一直存自有它存在的充分理由。
Families are matters of millennia, far beyond a few generations.
家庭，事关千年，它远远超越了几代人。
Taiji’s men have chased whales on Japan’s coast for perhaps millennia.
而太地人在日本沿海捕鲸的历史可能已经有上千年了。
Human beings have been seeking effective ways to deal with complexity for millennia.
几千年来，人类一直在寻找解决复杂性的有效方法。
The question has bothered philosophers for millennia and computer scientists for decades.
这个问题困扰了哲学家们上千年，也困扰了计算机科学家们数十年。
Falling water levels are not the only changes at Lake Suguta over the past several millennia.
在过去的几千年里水位下降并不是苏加塔湖唯一的变化。
Given time time not in years but in millennia life adjusts, and a balance has been reached.
经过了一定时间——不是以若干年计而是以若干千年计的时间——生命开始适应环境，并形成了一种与环境的平衡。
Given time — time not in years but in millennia life adjusts, and a balance has been reached.
经过了一定时间——不是以若干年计而是以若干千年计的时间——生命开始适应环境，并形成了一种与环境的平衡。
They're astronomically brilliant in comparison to anything humans are likely to invent for millennia.
未来几千年，不论人类的发明多么辉煌，和它们相比，不过是璀璨星河中的些微星光。
The parasite has plagued man for millennia. Chinese texts from 2700BC describe plants to treat its fevers.
公元前2700年中国的文字资料就记载着一些植物能治疗由疟疾引起的发烧的。
People have been trying to find the best financial advice ever since the first COINS were minted millennia ago.
在几千年前第一枚硬币铸好时，人们就开始寻求最好的理财秘诀。
The tribal chief, 62-year-old Felix Quispe, 62, says the river that has sustained them for millennia is drying up.
62岁的部落首领费利克斯 • 基斯佩(Felix Quispe)说，几千年来他们赖以生存的那条河流正逐渐干涸。
‘The species’ best minds have flung themselves at the puzzles for millennia but have made no progress in solving them.
人类最聪明的头脑已经为这些迷样的问题奋斗了数千年却毫无进展。
While solar activity is currently increasing in its standard 11-year cycle, this same cycle has occurred over millennia.
虽然，太阳活动目前在其标准的11年周期中逐渐增加，这种固定的周期持续了几千年。
"Think centuries or millennia, not decades," said Dr. Dyson, who also said he approved of the Planetary Society project.
“想想几百年或几千年后，而不是几十年，”戴森博士说，他说他认为行星协会的项目是可行的。
For millennia, herbal remedies were the only medicines available to help soothe aches and pains, and treat illnesses.
千百年来，草药是减轻病痛和治疗疾病的唯一药物。
For millennia, herbal remedies were the only medicines available to help soothe aches and pains, and treat illnesses.
千百年来，草药是减轻病痛和治疗疾病的唯一药物。
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