評論
打印
It's impossible to know how or when,
我們無從得知方法或時間，
but somehow these chemicals come together
總之這些化學物質結合起來
to create life.
創造生命
The water is now full of microscopic organisms.
水里滿是微生物。
These single-celled bacteria are the
這些單細胞細菌
earliest forms of life on Earth.
是地球上最初的生命形態，
This is a defining moment in the making of the planet.
這是地球形成史上決定性的一刻。
Microscopic life is underway.
微生物出現
For hundreds of millions of years
但接下來數億年
nothing changes.
什么都沒改變
The only life is single-celled bacteria.
唯一的生物是單細胞細菌。
To find more complex life,
想找到更復雜的生命，
we need to fast forward to 3.5 billion years ago,
我們必須快轉到35億年前
and a shallow ocean.
以及一片淺海。
These look like rocks, or even plants,
這些看起來像巖石，甚至像植物，
growing out of the sea bed.
似乎是從海床上長出來的
Each mound is a colony of living bacteria
其實它們都是
called a stromatolite.
疊層石菌落。
These bacteria turn sunlight into food,
這些細菌把陽光變成食物，
a process called photosynthesis.
這種光合作用
It uses the power of sunlight to tranform
借助陽光的力量，
carbon dioxide and water into glucose,
把二氧化碳和水變成葡萄糖。
a simple form of sugar.
它是一種單糖
And this magical transformation releases
這種神奇的轉變釋放出副產品，
a by-product, a gas called oxygen.
即一種名為氧的氣體。
Underwater, the stromatolites slowly
在水底，疊層石慢慢
fill the oceans with oxygen.
讓海洋充滿氧氣
The oxygen then turns traces of iron into
氧氣把水里的鐵變成鐵銹
rust, which fall to the ocean floor,
鐵銹落到海床，
to form deposits of iron rich rock.
形成富含鐵的巖石。
