He made a weak attempt to look cheerful.

　　他有氣無力地?cái)[出高興的樣子。

　　You're not your usual cheerful self today.

　　你今天不像往常那么快快樂樂的。

　　He felt bright and cheerful and full of energy.

　　他感到興高采烈，渾身充滿活力。