He buried his face in his hands to hide his disappointment.

buried 是动词 bury 的过去式，意思是"埋、掩埋"。 his 是代词 he 的所有格形式，表示"他的"。 face 的意思是"脸、面部"。 in 是介词，表示"在...里面"。 buried his face in his hands 这个短语字面意思是"把脸埋在双手里"，用来形容一个人因为羞愧、悲伤或失望而用手遮住脸的动作。