When we are first exposed to the drag-and-drop idiom, it seems simple, but for frequent users and in some special conditions, it can exhibit problems and difficulties that are not so simple.

• 当我们第1次见到拖放习惯用法时，它看上去似乎很简单。 但对于常用用户和一些特殊情况来说，它会带来一些并不简单的问题和困难。