評論
打印
Voice 1: When scientists first began to study DNA they could not see very much. The technology they used was not powerful enough. Later, technology improved. Technology could then help the scientists get a better look at DNA.
聲音1：當科學家最開始研究DNA時，他們沒有發(fā)現(xiàn)太多信息。他們所使用的技術不夠強大。后來，技術革新了。改進后的技術能幫助科學家更好地了解DNA。
Voice 2: In the 1950's scientists discovered that DNA was a kind of chain. This chain had millions of very small chemical substances linked together. They discovered that these substances formed DNA. But there was too much information in DNA for them to write down and study.
聲音2：上世紀50年代，科學家發(fā)現(xiàn)DNA是一種鏈狀結構。這種鏈狀結構包含數(shù)百萬種連接在一起的微小化學物質(zhì)。他們發(fā)現(xiàn)這些是組成DNA的物質(zhì)。但是，DNA有太多供科學家記錄并研究的信息。
Voice 1: They did know that the chain of DNA is made of four important chemical substances. Scientists gave each of these substances short names. Their short names are A, T, C, and G. The order of these letters, or substances tells a body how to grow and act. It is called a DNA code.
聲音1：他們知道DNA由4種重要的化學物質(zhì)構成。科學家給這些物質(zhì)取了簡短的名字。分別是A、T、C和G。這些字母或這些物質(zhì)的順序決定了一個人的生長和行為模式。這被稱為DNA密碼。
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