Suggested translation for discussion :

If the count 不低于the control之50%或不高于the control之200%

If the count 落于the control之50% - 200%的区间

If the count 不超出the control之50%或200%

If the count 在the control之50%至200%之间

The expression in the original is ambiguous and should be avoided, 亦不宜直译.

What is the English for 直译 and 意译?

直译literal translation, 意译free translation?

Thank you for your keywords “literal translation” which leads me to confirm that “literal translation” is 直译 and “free translation” is 意译 by searching in internet. Furthermore, I encounter something new regarding translation such as foreignization and domestication. I still have no idea on these terms and should pursue further study later. ( http://www.ilib2.com/A-ISSN~1671-6221(2008)03-0089-03.html )