用作定语
▲~+n.
We are all faithful listeners to the program.我们都是这档节目的忠实听众。
用作表语
▲S+be+~+prep.-phrase
The dog remained faithful to his master.这只狗始终忠于它的主人。
Do you think the film adaptation was faithful to the book?你认为这部改编的电影剧本忠于原著吗?
Her husband was always faithful to her.她的丈夫对她一直忠贞不渝。