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。
小路沿树林边延伸约一英里。
我们划船顺流而下约一英里。
我们骑车旅行，每天约骑30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.
您还可以参观距大厅约2公里的他的老房子。
You can also visit his old house about 2 kilometers away from the hall.
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.
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.
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