朴素: plain and simple, unadorned, simple living, not frivolous...
皮革: leather...
进程: process, course...
曙光: dawn, the dawn of a new era...
日复一日: day after day...
药材: medicinal ingredient...
常: always, ever, often, frequently, common, general, constant...
接力: relay...
的: used to indicate a modifying and modified relationship...
包: to cover, to wrap, to hold, to include, to take charge of, package, wrapper, container, bag, to hold or embrace, bundle, packet, to contract (to or for)...
