这些暗物质轮流产生重力场以提供足够的附加质量将星团聚集在一起。
This dark matter provides the extra mass, which in turn creates gravitational fields strong enough to hold the clusters together.
在宇宙空间中，一般认为黑洞产生的强引力场可以把周围吸所有的物质吸入其中。
In space, black holes are believed to generate intense gravitational fields that suck in all surrounding matter.
我收到一个家伙写来的信，是关于我写的一集Doctor Who剧本，跟超压缩物质、简并态物质和引力场的关系。
'I had a letter from a guy about something I'd written in a Doctor Who script, to do with super-compressed matter, degenerate matter and gravitational fields.
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