I feel lonely when I eat lunch by myself.
當我自己一個人吃午餐時，我感到寂寞。
She felt lonely after moving to a new school.
她轉到新學校後感到孤獨。
He is lonely at home because his parents work late.
因為父母工作到很晚，他在家裡感到孤單。
The lonely boy sits quietly in the classroom.
那位寂寞的男孩安靜地坐在教室裡。