/ˈseɪfti ||; ˈseftɪ/noun
[U] the state of being safe; not being dangerous or in danger 安全:
In the interests of safety, smoking is forbidden.禁止吸烟,以策安全。road safety(= the prevention of road accidents)道路安全New safety measures have been introduced on trains.火车上已实行新的安全措施。