He trudged home feeling lonely and let down.

　　他步履艱難地往家走，感到孤獨而沮喪。

　　I felt pretty lonely last year being on my own.

　　我去年獨自生活時(shí)感到特別孤獨。

　　Sam was very lonely when he first moved to New York.

　　薩姆剛搬到紐約時(shí)非常寂寞。