1924年12月，弗雷德里克·约里奥参观了研究所，在那里他遇见了玛丽·居里。
In December 1924, Frederic Joliot visited the Institute where he met Marie Curie.
这项工作为詹姆斯·查德威克爵士发现中子铺平了道路，尤其是为伊莲娜和弗雷德里克·约里奥特·居里在1934年发现人工放射性奠定了基础。
This work prepared the way for the discovery of the neutron by Sir James Chadwick and, above all, for the discovery in 1934 by Irène and Frédéric Joliot-Curie of artificial radioactivity.
这些洞穴延伸约12英里。
我们划船顺流而下约一英里。
“我不认为在过去约25年里有政府妥善地处理过这个问题。”—“我赞同这一观点。”
"I don't think a government has properly done it for about the past twenty-five years."—"I'd go along with that."
他们将约一吨重的罐装食品装到了小卡车的有篷拖斗里。
They loaded about a ton of canned goods into the covered bed of a pickup truck.
据说他们在长征中走了大约25000里（约12500公里）。
It is said that they walked about 25,000 li (about 12,500 kilometers) during the Long March.
长江长约6300公里。
它们每小时可以走约25英里。
行程约3.6万公里。
阆山位于新宁县，距长沙约500公里。
Langshan Mountain, lying in Xinning County, is about 500 kilometers away from Changsha.
麦肯齐河是加拿大最长的河流，全长约1000英里。
At some 1,000 miles, the Mackenzie is the longest river in Canada.
密西西比河全长约2300英里，是美国最长的河流。
At some 2,300 miles in length, the Mississippi is the longest river in the United States.
从广元到成都（约290公里）坐直达快车需要多长时间？
How long will it take to travel from Guangyuan to Chengdu (about 290 km) by Direct Express Train?
这场比赛在威尔士的一个小镇举行，距离伦敦约200英里。
This race takes place in a small town in Wales, about 200 miles from London.
这个陨石坑现在深埋在沉积物中，最初直径约200公里。
The crater, now deeply buried in sediment, was originally about 200 kilometers in diameter.
边界线最长的部分与美国阿拉斯加州接壤，长约2475公里。
The longest part of the border is shared with Alaska in the USA, and it is about 2,475 km long.
走出车站，我看到一座巨大的山，就在正南方约10英里处。
Walking out of the station, I saw a huge mountain about 10 miles away right to the south.
这条路是在开罗西南方约45英里的法尤姆洼地发现的。
The road was discovered in the Faiyum Depression, about 45 miles southwest of Cairo.
这是因为目标将处于地球上空约500公里处。
This is because the object will be about 500 kilometers above the Earth.
巨石阵是英国索尔兹伯里平原上的一座巨石纪念碑，位于伦敦西南约85英里处。
Stonehenge is a megalithic monument on the Salisbury Plain in England, about 85 miles southwest of London.
该区占地1770平方公里。它在北京西南方向约100公里处。
The area covers 1,770 square kilometers. It's about 100 km southwest of Beijing.
接下来是伊利运河，这是当时的一项巨大工程，全长约350英里。
Next came the Erie Canal, an enormous project in its day, spanning about 350 miles.
国会拨款超过250亿美元，并开始修建约4万英里的新路。
Over $25 billion was appropriated by Congress, and construction began on about 40,000 miles of new roads.
国会拨款超过250亿美元，并开始修建约4万英里的新路。
Over $25 billion was appropriated by Congress, and construction began on about 40,000 miles of new roads.
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