a person who explains a concept, topic, situation, etc. 解释者: 解释概念,主题,情况等的人。He's a good explainer and always gives lots of examples to illustrate what he's talking about. 他是一个很好的解释者,总是举很多例子来说明他在说什么。
a video or a piece of text that explains a concept, topic, situation, etc. 解释器: 解释概念,主题,情况等的视频或一段文字。Here's a video explainer on how the nervous system works. 这里有一个关于神经系统如何工作的视频解释器。 This helpful explainer sets out the key issues surrounding the elections. 这位有益的解释者阐述了围绕选举的关键问题。