詼諧的語(yǔ)言，生動(dòng)的內(nèi)容一分鐘快速掌握科技最新動(dòng)態(tài)

>>本期節(jié)目音頻下載<<

How Deep Is the Ocean?

It’s often said we know more about the moon than we do about the depths of the ocean. There is a lot we don’t know about the H2O that covers much of the planet. Now we’re getting closer, though, to an important understanding: Just how deep are the oceans, and what’s the volume of all that water? The latest, best estimate is 1.332 billion cubic kilometers, according to research published in the journal Oceangraphy. [Matthew Charette and Walter Smith, Ogbh]
都說(shuō)人類(lèi)對(duì)月球的了解要比對(duì)海洋深度的了解要多得多。確實(shí)，對(duì)于覆蓋地球表面大部分區(qū)域的H2O，我們真是知之甚少。不過(guò)，我們正越來(lái)越接近相當(dāng)重要的發(fā)現(xiàn)：海洋到底有多深？它的總水量又是多少？據(jù)《海洋學(xué)》相關(guān)研究記載，最新最準(zhǔn)確的估計(jì)，海洋總水量為13.32億立方千米。

That’s actually lower than previous estimates by about five Gulf of Mexicos. It’s not that there’s less water out there. Rather, new satellite images have presented a clearer image of all the mountain ranges strewn across the ocean floor. Those peaks displace what we’d thought of as space for water.
這個(gè)數(shù)據(jù)要比之前所估計(jì)的大約要小5個(gè)墨西哥灣的水量，但這并不表示水少了。事實(shí)上，從最新衛(wèi)星圖像中我們可以看到更加清晰的海底山脈分布情況，這些山脈分布的地方之前也被當(dāng)成了海水。

But even the new satellite-based radar images still need fine-tuning. As researcher Walter Smith says, “We’re seeing only really big mountains, and in a blurry way. The resolution is 15 times worse than our maps of Mars and the moon.”
不過(guò)即使是新型衛(wèi)星雷達(dá)圖像仍有待調(diào)整。正如沃特·史密斯所說(shuō)：“我們看到的只是大型山脈，還模模糊糊的。分辨率要比火星和月球的衛(wèi)星圖像低15倍?！?/div>

Ship-based sonar would help, but ship-based instruments have mapped only about 10 percent of the ocean floor so far. We really do know more about the surface of the moon than the total ocean floor.
盡管船舶聲納技術(shù)也用得上，但是迄今為止利用船舶器械僅僅繪制出海底地貌的10%?？磥?lái)，我們對(duì)月球表面的了解確實(shí)要比對(duì)海底地貌的了解要多得多啊。

點(diǎn)擊進(jìn)入?yún)⑴c科學(xué)60秒查看背景資料和單詞總結(jié)>>>


聲明：音視頻均來(lái)自互聯(lián)網(wǎng)鏈接，僅供學(xué)習(xí)使用。本網(wǎng)站自身不存儲(chǔ)、控制、修改被鏈接的內(nèi)容。"滬江英語(yǔ)"高度重視知識(shí)產(chǎn)權(quán)保護(hù)。當(dāng)如發(fā)現(xiàn)本網(wǎng)站發(fā)布的信息包含有侵犯其著作權(quán)的鏈接內(nèi)容時(shí)，請(qǐng)聯(lián)系我們，我們將依法采取措施移除相關(guān)內(nèi)容或屏蔽相關(guān)鏈接。