invisible
/ɪnˈvɪzəbl; ɪn`vɪzəbl/ adj
1 ~ (to sb/sth) that cannot be seen; not visible 看不见的; 不可见的
distant stars that are invisible to the naked eye, ie that cannot be seen except with a telescope or binoculars 肉眼看不到的遥远的星球.
2 [usu attrib 通常作定语]
(commerce 商) in the form of services (eg banking, insurance, tourism, etc) rather than goods or raw materials 服务业形式的（如银行、 保险、 旅游等）; 非贸易的; 无形的
invisible exports/trade 无形输出[贸易].