focus & difficult point 教学重点和难点
In TCSL intonation teaching and learning, neutral tone is a focus as well as a difficult point.
对外汉语语音教学中，轻声是语音教学的重点和难点。
Effect of transient head change under persistent rainfall on the stability of geo-slope is obvious, and it is always the focus and difficult point in geotechnical engineering or related fields.
持续降雨条件下，边坡浅层所形成的暂态水头变化对边坡稳定性具有重要的影响，一直是水工渗流研究领域内的热点和难点。
Network topology inference is one of the basic functions of a network management system, and the AS-level topology inference is its focus and difficult point.
网络拓扑推理是网络管理系统的基本功能之一，A S级拓扑推理是其重点和难点。
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