billion years 中文意思是什麼
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In fact, all life during the more than one billion years of the archaean was bacterial
實際上，所有生活在archaean的超過一十億年期間是細菌的。 -
It was early in the archaean era, 3. 8 to 2. 5 billion years ago, that life first appeared on earth
它在及早在archaean時代， 3 . 8到2 . 5十億年前，生活第一次出現在地球上。 -
Even at meridiani, basaltic sands lie atop the lake sediments, indicating that the site has been parched for two billion to three billion years
甚至在子午線地盤，玄武巖質的沙披覆在湖床沉積物上，顯示此地已經乾涸了20 ~ 30億年。 -
It has a half-life of about 41/2 billion years.
它的半衰期大約為45億年。 -
At some time more than five billion years ago the universe started.
在50億年前的某個時候，宇宙開始形成。 -
The youngest rocks found on the moon are 3 billion years old.
在月球上發現的地質年代最晚的巖石已有30億年歷史了。 -
The hill, shaped with the weathering and eroding along the plumb joints of the granodiorites which formed about 2. 7 billion years ago, is like buddha palm especially verisimilitude in green bosk
佛掌山為27億年左右形成的花崗閃長巖，沿垂直節理風化剝蝕后形成奇特的佛掌型山，在綠樹叢中尤顯逼真。 -
Looking at these isotopes allows the chondrules to be dated, and they were formed 4. 56 billion years ago
觀察這些同位素可以估算出隕石球粒的年齡，他們是在45 . 6億年前形成的。 -
Their ancestors have been eating according to flavor for upwards of a billion years.
他們的祖先已經根據滋味來吃東西吃了十億年以上了。 -
Models of the solar system ' s early history posit that the frequency of impacts should have tapered off between 4. 5 billion and four billion years ago because most of the planetesimals ? the small rocky bodies that formed from the solar nebula ? were gradually cast out of the inner solar system or absorbed by the outer planets
描述太陽系早期歷史的模式假設，撞擊頻率應該在45 ~ 40億年前趨緩，因為大部份的微行星（由太陽星雲形成的小型石質天體）逐漸被驅逐出內太陽系或被外行星吸收。 -
The first three eons, which together lasted nearly 4 billion years, are grouped into a unit called the precambrian
第一三永世，一起持續幾乎4十億年，被編組入單位稱全寒武紀。 -
But almost all spiral galaxies are much older than 2 billion years
但是幾乎所有旋渦星系的年齡都超過了20億年。 -
The organisms living between 3 and 1 billion years ago were not as versatile as modern species, probably due to energy limitation.
生活在過去二十億年之間的有機體可能由於能量的限制，不如現代物種這樣五花八門。 -
It is possible, for example, that a very large body in the asteroid belt broke apart about 3. 9 billion years ago and that the debris was swept toward the earth - moon system
舉例來說， 39億年前可能有一個非常大的天體由小行星帶中分出，其遺屑向地月系統橫掃而來。 -
Yet oxygen gas did not begin to accumulate in the atmosphere until about 2 billion years ago.
但是大約在20億年前，氧氣才開始在大氣層中積累。 -
Our solar system was formed 4. 6 billion years ago
我們的太陽系被形成了4 . 6十億年前。 -
The supernovae exploded between 3. 5 and 10 billion years ago
超新星爆炸時間在35 - 100億年前。 -
What prompted the leap in complexity starting 1. 5 billion years ago
那麼是什麼推動了發生在15億年前的復雜性的飛躍呢？ -
About 5 billion years ago
五十億年以前 -
About 13. 7 billion years ago a tremendous explosion started the expansion of the universe
大約13 . 7十億年前巨大爆炸開始了宇宙的擴展。
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