Their house was buried by a landslide...是什么意思？

Their house was buried by a landslide...

他们的房子在一次塌方中被掩埋。

their

pron. 他（她，它）们的，在提及性别不详的人时，用以代替 him 或 her；

例句
Their permissiveness toward their children reflects the wild abandon of their own lives.
他们对孩子的放任折射出他们自身生活的放浪形骸。

house

n. 房屋，全家人，（从事某种生意的）公司，（英国）下议院；v. 给…提供住房，收藏，安置；

例句
He was born in 1768 in the house abutting our hotel.
他于1768年出生于我们旅馆旁边的一幢房子里。

was

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去式 ），在，存在，不受干扰；

例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

buried

v. 埋葬( bury的过去式和过去分词 )，掩埋，原谅，沉溺于；

例句
The men were caught in the act of digging up buried explosives.
那些人在挖掘掩埋的爆炸物时被逮个正着。

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

landslide

n. [地]山崩，大胜利；

例句
A seven-year-old boy was found dead after a landslide engulfed a block of flats...
山体滑坡掩埋了一栋公寓楼，造成一名7岁男孩丧生。