大约关于主题的1,500种出版物每年现下被出版。
About 1,500 publications on the subject are now published each year.
关于这个问题，粗略地说，我们每周能收到大约五十封来信。
Roughly speaking , we receive about fifty letters a week on the subject.
关于那名隐居者邻居们所知道的就是他已经在那栋楼里住了大约二十年了。
All that neighbours knew about the reclusive man was that he had lived in the building for about 20 years.
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