Translation of "clandestine" into Chinese

Have specific measures been taken to monitor the manufacturing methods used in clandestine laboratories?

是否采取了具体措施来监测秘密制药点所使用的制造方法?

The exact size of its membership remains difficult to ascertain owing to its clandestine nature.

由于该团体是地下组织,其实际成员数量难以确定。

And because of the clandestine nature of trafficking, victims have little access to medical or legal services.

同时由于贩运本质上是暗中进行的,受害者几乎很难获得医疗或法律服务。