Beijing ranks in first place in a list of cities that produced the most high-quality research in 2017, and nine other Chinese cities made the top 50, according to the Nature Index 2018 Science Cities, a supplement of the British scientific journal Nature, published on Thursday.

根据英国科学期刊 自然　周四发布的 2018年自然指数-科研城市　，北京在2017年科研城市中排名第一，另有9个中国城市进入前50名。

The list sorted out and ranked 200 cities worldwide by their 2017 fractional count, a metric for the share of contributions to the authorship of articles in 82 high-quality research journals.

该榜单根据2017年全球200个城市的科研分数排名，使用在82家高质量研究期刊发表论文的作者比例作为衡量指标。

To calculate the fractional count, all authors are considered to have contributed equally to the article.

The maximum combined fractional count for any article is 1.

0.

为了方便计算分数，认为所有作者对论文的贡献相等，任何文章的最大得分都是1.

0。

The 2017 fractional count for Beijing reached 2,143.

53, topping the list.

北京在2017年的分数达到了2143.

53，位居榜首。

The table accompanying the list also shows that authors in Beijing produced 4,396 articles in 82 high-quality research journals and accounted for 23.

5 percent of the papers published by China on these journals.

从排行榜中还可以看出，来自北京的作者在82种高质量研究期刊上发表了4396篇文章，占中国在这些期刊上发表论文的23.

5%。

However, other Chinese cities -- like Nanjing at 12th place, Wuhan at 19th and Guangzhou at 25th -- are rising rapidly in scientific research, resulting in the declining share of Beijing in China’s output for six consecutive years.

然而，中国其他城市——如南京排名第12位、武汉排名第19位、广州排名第25位——在科研方面增长迅速，导致北京在中国总分中所占的份额连续6年下降。

Shanghai at seventh is the other Chinese city among the top 10.

Hong Kong, Hefei, Hangzhou, Tianjin and Changchun were also ranked between the 21st to 50th places.

上海是中国另外一个跻身前10名的城市，排名第七。

香港、合肥、杭州、天津和长春也排分别在第21位到第50位之间。

【中国10座城市入选全球科研城市TOP50查看网站：[db:时间]】