消失 + 在 + Place + 中
消失 (xiāoshī) is a verb meaning 'to disappear' or 'to vanish.' It describes something ceasing to be visible or present. It is commonly followed by a location phrase with 在, as in 消失在茫茫大海中 (to disappear into the vast ocean).
太阳落山后,最后一丝光线也消失了。
Tàiyáng luòshān hòu, zuìhòu yī sī guāngxiàn yě xiāoshī le.
After the sun set, the last ray of light also disappeared.
那只小猫跑进巷子里就消失不见了。
Nà zhī xiǎo māo pǎo jìn xiàngzi lǐ jiù xiāoshī bùjiàn le.
That little cat ran into the alley and disappeared.
雾气渐渐消失,远处的山峰露了出来。
Wùqì jiànjiàn xiāoshī, yuǎnchù de shānfēng lù le chūlái.
The fog gradually disappeared, and the distant mountain peaks came into view.