imperceptibly; in subtle ways; without being aware of it; in effect but without the formal name

having no physical form or trace; invisible and impalpable; can describe something that is immaterial or has completely disappeared

International trade involving services and items that do not pass through customs, such as labor, patent rights, or tourism.

assets that do not have a physical form but provide long-term rights or benefits, including reputation, patents, trademarks, and copyrights

invisible export; the sale of services to people or businesses in other countries, such as banking, insurance, or tourism

contact lenses; primarily used in Mainland China

Reduction in value of fixed assets like machinery or equipment caused by technological progress rather than physical use; also called [[精神损耗|精神損耗|jing1 shen2 sun3 hao4]]