STEM与日常科技·英语30篇（3）

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DNA Storage Long-Term Stability Discussion

DNA存储长期稳定性讨论

DNA stores genetic information for millions of years in fossils—so scientists now encode digital files like books or videos into synthetic DNA strands.
One gram of dried DNA can theoretically hold 215 million gigabytes—enough for all Netflix streaming data for 100 years.
Unlike hard drives that degrade in 5–10 years or magnetic tape needing climate-controlled vaults, DNA lasts centuries if kept cold and dry.
Errors creep in during synthesis and sequencing, so researchers add error-correcting codes—like digital redundancy in QR codes.
Current costs remain high ($1M per GB), but prices drop 30% yearly as gene-editing tools become cheaper and more precise.
Archives in Norway and Japan already test DNA storage for preserving national records, languages, and cultural heritage.
Its biggest advantage isn’t capacity or speed—it’s longevity: DNA won’t become obsolete, since reading it only requires basic biochemistry.
While not for daily backups, DNA offers humanity’s first truly future-proof medium for storing irreplaceable knowledge across millennia.

精读 · 大约 10 分钟

听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。

③ 学 · 重点表达

DNA stores genetic information for millions of years in fossils—so scientists now encode digital files like books or videos into synthetic DNA strands. DNA能在化石中保存遗传信息数百万年——因此科学家如今将书籍或视频等数字文件编码进人工合成的DNA链中。
One gram of dried DNA can theoretically hold 215 million gigabytes—enough for all Netflix streaming data for 100 years. 一克干燥DNA理论上可存储2.15亿GB数据——足以容纳Netflix百年流媒体内容。
Unlike hard drives that degrade in 5–10 years or magnetic tape needing climate-controlled vaults, DNA lasts centuries if kept cold and dry. 与5至10年即退化的硬盘，或需恒温恒湿保险库保存的磁带不同，DNA只要保持低温干燥，便可保存数百年。

④ 懂 · 选一选

这篇中文题目最接近哪一句？ DNA存储长期稳定性讨论一次学校运动会的通知一份超市购物清单

课文第一句的意思更接近？ DNA能在化石中保存遗传信息数百万年——因此科学家如今将书籍或视频等数字文件编码进人工合成的DNA链中。今天学校放假了。请把窗户打开。

这一课主要在讲什么？（看英文标题） DNA Storage Long-Term Stability Discussion How to cook noodles A maths worksheet

⑤ 今天会说这一句

DNA stores genetic information for millions of years in fossils—so scientists now encode digital files like books or videos into synthetic DNA strands.

⑥ 跟读并录音

DNA stores genetic information for millions of years in fossils—so scientists now encode digital files like books or videos into synthetic DNA strands.

第一版：录下来、回听、再听标准音。系统打分以后再加。

⑦ 说 · 自己来一句

用今天的表达，自己说一句。

例子：DNA stores genetic information for millions of years in fossils—so scientists now encode digital files like books or videos into synthetic DNA strands.