billion years ago 中文意思是什麼
billion years ago
解釋
億年前-
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。 -
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 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。 -
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 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。 -
Just as the solar system was forming some 4. 6 billion years ago, it turned itself inside out
太陽系的形成發生在大約46億年前，那會兒它裡外翻了個身。 -
For example, the researchers date the split between plants and animals at 1. 6 billion years ago
例如，研究者確定植物和動物大概是在16億年前開始產生差異。 -
Follow - up studies using the molecular clock produced estimates for this split that varied significantly, ranging from as old as one billion years ago to as young as just before the cambrian period
后來使用分子時鐘來估算分支時間的研究結果，差異都很大，可能早至10億年前，晚至寒武紀即將開始時。 -
Some point to the increase in oxygen that began around 2 billion years ago supporting a higher metabolic rate and allowing the evolution of larger organisms and more complex body structures
一些點對在開始大約2十億年前支持更高的新陳代謝率和允許更大的有機體和更加復雜的身體結構的演變的氧氣的增量。 -
The moon ' s heavily cratered surface is the result of intense pummeling by space rocks between 4. 1 billion and 3. 8 billion years ago
月球的麻子臉是41億年前「星球」大戰的結果。當時宇宙中大批石塊與月球相撞。 -
Nearly 36 billion years ago, almost twice as long as the age that modern astrophysics supposes to be the age of the universe, the set of mutually reflective relations that constitute the paired universe of matter and antimatter began to enter and, thereby, define three - dimensional space
將近360億年以前，差不多比現代天體物理學推想的宇宙年齡長2倍，互相反射關系組合構成物質和反物質開始進入的成對宇宙，因此，定義為三維空間。 -
For example, two billion years ago ( about when the oklo deposit formed ) uranium 235 must have constituted approximately 3 percent, which is roughly the level provided artificially in the enriched uranium used to fuel most nuclear power stations
例如， 20億年前（大約是歐克陸礦床形成的時候）鈾235的比率約為3 % ，濃度相當于大多數核能發電廠所使用、人工提煉出的高純度鈾。
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