并列题名：Difficult Asthma Difficult Asthma 并列题名：Difficulte d'etre 并列题名：Pediatric asthma 并列题名：Difficult Conversations 并列题名：Difficult conversations 并列题名：Difficult personalities 并列题名：Difficult Flying-Off 并列题名：From difficult to distrubed 并列题名：Face difficulty with calmness