expanding section meaning in English

扩大段
扩展段

To restore automatic outlining and collapse all expanded sections
恢复自动大纲显示并折叠所有已展开的部分
To conceal an expanded section , click the minus sign in the indicator margin
若要隐藏已展开的部分，请单击指示器边距中的减号( - ) 。
This paper discusses how to improve expand section ' s lining of heavy - calibre and high - tempreture , the steel - fibre lining is improved to be the lining of firebrick and fireproof material , to avoide the lining drop and meet the needs of production
摘要阐述了如何将大口径高温膨胀节衬里由钢纤维双层衬里改为耐火砖加耐火浇注料结构，避免了衬里脱落，满足了生产需要。