烧焦的糖，用于为食物染色并使之变甜。

Burnt sugar, used for coloring and sweetening foods.

youdao

催化剂因积炭失活后，可通过器内烧焦再生使催化剂活性得到恢复，降低了生产成本。

After deactivation due to coking, catalyst could be regenerated by in-situ regeneration so as to reduce producing cost.

youdao

这回他不用烧焦的纸，而代之以几股棉线。他把几股棉线搓在一起，呈发夹状，然后把已搓成的灯丝放在炉内烧焦，也就是使之碳化。

This time, instead of using charred paper, he took several strands of cotton, twisted these together into the shape of hairpin, and charred, or carbonized, this filament in an oven.

youdao