an extra layer of material sewn to the inside edge of a piece of clothing to make it stronger, or to the outside, especially of collars and the ends of sleeves, for decoration

a blue jacket with white facing 有白色镶边的蓝色短上衣

an outer layer covering a wall, etc.

The wall was built of rubble with a facing of stone. 墙壁以粗石砌成，石头覆面。

turned towards the stated direction

Most avalanche accidents occur on north- and east-facing slopes. 大多数雪崩事件发生在面北和面东的斜坡上。