exhalation
/ˌekshəˈleɪʃən/noun
mass noun
1- the process or action of exhaling呼出。
1.1
- count noun an expiration of air from the lungs呼气：
he let his breath out in a long exhalation of relief.
他如释重负地长长地呼了一口气。
1.2
- count noun an amount of vapour or fumes given off散发的蒸气（或烟雾）。