史密斯先生和费伯先生是多年的商业合作伙伴。

Mr. Smith and Mr. ___Ferber have been business partners for many years.

儿科医生建议我们尝试费伯法来改善宝宝的睡眠问题。

The pediatrician suggested we try the ___Ferber method to improve our baby's sleep issues.