synthetic dye的用法和樣例：
例句
- Indelible ink often consists entirely of synthetic dyes.
不褪色墨水一般均由合成染料構成。 - Natural dye extracts, however, are just as quick to use as synthetics but produce the genuine natural colours of real natural dyes.
然而，天然染料，也像合成染料一樣正被人們更多的接收和使用，但是只有天然染料才能產生真正逼真的顏色。
