No improvement to this sentence is necessary. It makes perfect sense on its own and sounds right. "Either" always takes an "or" else the word wouldn't make sense, as it's meant to contrast binary options.
eg.
I'm either going to eat food or drink water.
An adverb ends in -ly, but not always
Answer:
Child labor, or the use of children as servants and apprentices, has been practiced throughout most of human history, but reached a zenith during the Industrial Revolution. Miserable working ... well here is some not all though
Explanation:
Answer:
It's either the last or second one
