在英语论文中，说明通常包括对论文的背景、目的、研究问题和研究方法进行详细阐述。

例如，你可以这样写说明：

"The purpose of this paper is to examine the impact of social media on the self-esteem of adolescents. To accomppsh this goal, we conducted a survey with a sample of 100 adolescents, asking them questions about their social media usage and their self-esteem. We also conducted in-depth interviews with a smaller sample of 20 adolescents to gain a more detailed understanding of their experiences. Our findings suggest that there is a relationship between social media usage and self-esteem, with higher levels of social media usage being associated with lower levels of self-esteem. We discuss the imppcations of these findings and suggest directions for future research."

这段话的意思是：本文的目的是研究社交媒体对青少年自尊的影响。为了实现这一目标，我们对100名青少年进行了调查，询问他们有关社交媒体使用和自尊的问题。我们还对一小部分20名青少年进行了深入访谈，以获得更详细的了解。我们的研究结果表明，社交媒体使用与自尊之间存在关系，社交媒体使用水平较高与自尊水平较低之间存在相关性。我们讨论了这些结果的意义，并提出了未来研究的方向。