Significant number 翻成中文是什麼?

The investment funds industry in the Cayman Islands has achieved significant growth in recent years, with 4,800 investment funds currently recorded in official Cayman Islands registers.  In addition, there are a significant number of investment funds, primarily closed-ended funds, which are not recorded, so the... 顯示更多 The investment funds industry in the Cayman Islands has achieved significant growth in recent years, with 4,800 investment funds currently recorded in official Cayman Islands registers.  In addition, there are a significant number of investment funds, primarily closed-ended funds, which are not recorded, so the number is likely to be significantly higher.  The amount of funds under management is difficult to estimate, but it is safe to say that it is in the many hundreds of billions of US dollars.  請問紅色部色的段落該怎麼翻譯才好呢?In addition是另外,there are a significant number of investment funds==>這句就很不懂,大意似乎是說還沒登記在案的更多,不只那4800建投資型基金,可是精確的翻法,紅色的部份該怎麼翻呢?請英文好的人幫幫忙么!           
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