security thread（防伪安全线）是什么意思？音标发音+图解场景

防伪安全线 /sɪkjˈʊəɹɪti ˈθɹɛd/ n

English: security thread · 防伪安全线

释义：A feature to prevent counterfeiting; a dark line that is visible in transmitted light is inserted into the paper.

这个词出现在以下图解场景（1）