In Lavie's game, people watch as the letters N and X appear and disappear in a certain area on the computer screen.

在拉维的游戏中，人们看着字母 N 和 X 在电脑屏幕的某个区域出现和消失。

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The guerrilla units mysteriously appear and disappear in operation behind enemy lines, without the enemy's being able to do anything about them.

游击队在敌人后方神出鬼没地活动， 敌人无奈他何。

《新英汉大辞典》

People don't appear and disappear the way you do.

人类不会像你那样突然出现又突然消失。

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These problems may appear and then disappear, sometimes resulting in long periods when there are no problems at all.

VOA: special.2009.01.06

Sometimes, symptoms of the disease appear and then disappear for a long time.

VOA: special.2009.01.06

In the capitalist process, described by Joseph Schumpeter as waves of creative destruction, billionaires appear and disappear all the time.

FORBES: Billionaires

Or in a sonnet called "My Transparent Brother" by Luigi Bob Drake, sections of the poems appear and disappear and change position.

BBC: 'E-poetry' creates electronic sonnets

The Kabuki stage is equipped with several gadgets, such as revolving stages and trapdoors through which the actors can appear and disappear.

UNESCO: Intangible Cultural Heritage