1、The synthesis of renewable “drop-in” aromatics from biomass-derived chemical building blocks is a rapidly emerging technology aimed at reducing the dependency of the chemical industry on fossil resources.这句话中的“drop-in”是什么意思呀。看到好多合成文献里面用到这个短语。 /2、The development of new routes for the production of “drop-in”aromatic chemicals from renewable resources is currently receiving considerable attention because of the increased demand, finite fossil resources, and the recognized need for more sustainable production routes.