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The as-prepared hollow spheres consist of small nanoparticles with a size of ca .100 nm
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The Latin word circa, literally meaning about, is often used to describe various dates (often birth and death dates) that are uncertain. The word is often abbreviated as c., ca., or cca.
Æäʵ¿ÉÒÔ¼òµ¥µØÀí½âΪabout, around.
Èç¹ûÊDzàÄêÊý¾Ý, cal. ±íʾУÕý, ÓÐÈËҲд×÷ca., I don't know why!
17Â¥2012-04-11 00:35:03
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circa Õâ¸öµ¥´ÊµÄ¼òдÁË£¬ÒÔǰÓмûµ½¹ý¡£
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Daemon1126

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The future belongs to those who believe in the beauty of their dreams
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2Â¥: Originally posted by hydrogel at 2012-04-10 17:44:30:
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