Leaves used for black tea ferment for days before they're heated, causing the leaves to blacken and many chemical changes to happen within them.
而制作红茶的叶子会在被加热之前先进城数日的发酵，导致这些叶子变成黑色，并且在其中发成多种化学反应。
2
Biodegradable polyesters are polymer materials, they can be synthesized by chemical methods, enzymatic-catalysis and ferment.
生物可降解聚酯是一种新型高分子聚合材料，可通过发酵、化学方法和酶催化来合成。
3
L-glutamic acid is a kind of important chemical compound, which is mainly produced by ferment method from maize, wheat, sweet potato, rice, sugar molasses, beet molasses.