AS Canadian pop star Justin Bieber said goodbye to fans at his Macao (澳门) concert on Oct 12, he finished the Believe Tour in Asia. People criticized the 19-year-old for being impolite (失礼的) earlier this year. But with songs and concerts, he once again proved himself a talented singer. He also shows his undefeated (坚强不屈的) spirit. Just like what he says in this song: When facing difficulties, Bieber never says never. Listen to it if you are feeling low. It can give you courage (勇气) .