volunteered

v.

自动提供，自愿效劳( volunteer的过去式和过去分词 )；主动建议（或告诉）；（未经当事人同意）举荐；自愿参军，当志愿兵

volunteer services义工服务；志工服务台

1. He enlisted as a volunteer in the army.
   他以志愿兵从军。
2. He works as a volunteer at off time.
   在业余时间

1. He volunteered a statement to the police.
   他自动向警方供出情况。
2. Many people volunteer to work on the farms.
   许多人自动到农场劳动。
3. They volunteer for good causes.
   她们自愿做好事。

The credibility of volunteered geographic information
Volunteered Geographic Information: The nature and motivation of producers
Assuring the quality of volunteered geographic information
Citizens as Sensors: The World of Volunteered Geography
The importance of volunteered geographic information for the validation of flood inundation models
Volunteered geographic information: future research directions motivated by critical, participatory, and feminist GIS
How Good is Volunteered Geographical Information? A Comparative Study of OpenStreetMap and Ordnance Survey Datasets
Crowdsourcing geographic knowledge: volunteered geographic information VGI in theory and practice
Urinary incontinence during sexual intercourse: a common, but rarely volunteered, symptom
How Many Volunteers Does it Take to Map an Area Well? The Validity of Linusa?? Law to Volunteered Geographic Information