decongestant的复数形式怎么写

In the past, parents often believed that pain relief from antihistamines and decongestant's was necessary.过去, 家长往往认为,用抗组胺药和减充血剂来缓解疼痛是必要的....

n.解充血药...

decongestant的音标：decongestant的英式发音音标为：[ˌdi:kən'dʒestənt]decongestant的美式发音音标为：[ˌdikən'dʒɛstənt]...