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。

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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。

youdao