collapsable

1. 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。
2. Some cameras have collapsable lens.
   一些照相机的镜头可以伸缩。

adj

1. capable of collapsing or being collapsed
   1. a collapsible boat

   Synonym:    collapsible