inaccessible number

• 不可达数

inaccessible number的用法和样例：

例句

1. China is running a number of unlawful detention centres in which its citizens can be kept for months, according to Human Rights Watch.
   人权观察组织称，中国境内存在一定数量的非法拘留点，市民可能在这里被囚禁长达数月之久。