disappeared是什么意思？

But when the researchers plugged in a number of other variables, such differences disappeared.

If you cover a baby's favorite toy with a piece of cloth, the baby thinks the toy has disappeared and stops looking for it.

lions have disappeared from much of Africa, but for the past few years scientists have wondered if the big cats were hanging on in remote parts of Sudan and Ethiopia.

The limitation has disappeared.

Hospital workers in at least one case deserted their workplace in panic, thus halting the administering of potentially unclean disease spreading injections, but Ebola has not disappeared.

They have both disappeared for good

Is it if the railways happen being nationalized, they would simply have disappeared?