确保出风口没有被堵住，以保证空气流通。

Make sure the ___vent is not blocked for proper airflow.

他打电话给朋友，只是为了宣泄一下这一天积累的压力。

He called his friend just to ___vent about the stress he'd built up during the day.

请确保空调的通风口没有被家具挡住。

Make sure the ___vent of the air conditioner is not blocked by furniture.