在为化学反应供能并最终生成糖之前，电子通过由分子作载体的反应释放然后在分子链上传递。
The electrons released by this reaction are taken up by carrier molecules and then passed along a chain of such molecules before being used to power the chemical reactions that ultimately make sugar.
最后，一个叫做辅助剂的化学品混合体可以帮助免疫系统注意到蛋白质载体和这些半抗原。
Finally, there is a chemical cocktail called an adjuvant that helps get the immune system to pay attention to the carrier protein and the haptens.
一种化学药品，比如滴滴涕（DDT，一种杀虫剂，在环境中非常难降解，多数国家已经明令禁止或限制生产和使用DDT），从上个世纪早期以来一直被用于控制农作物虫害或者疾病载体。
An assortment of chemicals, such as DDT, have been employed since early in the last century to control crop pests or carriers of diseases.
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