也许 yěxǔ perhaps / maybe
概念 concept: 估计 Estimation
话题 topic: 特点
水平 Level: 基础 Elementary (HSK 1)
Zhè shì gè Měiguó zì, yěxǔ nǐ bù dǒng.
This is an American term and you probably do not understand it.
Source: Teahouse by Lao She 老舍茶馆
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