This room would look more cheerful for a spot of paint.

　　這個房間油漆一下就會顯得更加悅目。

　　You're not your usual cheerful self today.

　　你今天不像往常那么快快樂樂的。

　　Why are you so bright and cheerful today?

　　你今天怎么這么高興？

　　He felt homesick, but made a brave attempt to appear cheerful.

　　他很想家，但卻竭力表現(xiàn)得很高興。