chicken什么时候是可数名词

　　She spooned the sauce over the chicken pieces.

　　她用勺把沙司浇到鸡块上。

　　I personally would rather roast a chicken whole.

　　我个人更愿意烤整鸡。

　　He went to the party in a giant chicken costume.

　　他是打扮成一只大鸡去参加聚会的。