A face mask used by protestors to protect their identity, hence anonymous.<br/>匿名面膜<br/>anonymous、face、hacking、hacktivism、Like collection、mask、protest、remix 176919、revolt<br/>匿名、面對、黑客、黑客行為、喜歡收藏、面具、抗議、混音176919、反叛<br/>資料來源：openclipart ( https://openclipart.org/ )