a lacking in security or safety
a involving or causing danger or risk; liable to hurt or harm
s not safe from attack
a. 不安全的, 不安稳的, 危险的
[经] 不安全
1. The stairs are unsafe because they are broken.
这段楼梯不安全，因为它坏了。
2. It's unsafe to walk alone at night in this area.
在这个地区晚上独自走路是不安全的。
3. The children should wear helmets when riding their bikes to stay safe.
孩子们骑自行车时应该戴头盔，以保持安全。