collapsable
adj. 可折叠的
例句
The Tree shown on the left side of the split pane should be expandable/collapsable and it shouldn't result in page refresh and thus enhancing the user experience.
显示在分隔面板左侧的树应该可以展开/折叠(expandable/collapsable)而且不应导致页面刷新,这样会增强用户体验。