remove reference：删除引用//工程文件夹里依然有这个文件
move to trash：彻底删除这个文件//彻底扔到了垃圾箱里
Basically if you check “Copy to project” when adding the file, you should chose “Move to trash” when deleting, otherwise pick “Delete references”. This latter option will leave the file in place and just remove the reference to it
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