Unprotectedness
[医]未设防，未保护，未加保护
🗣️ 情景例句
It's tough getting an O.K. from the boss.
很难从老板那听到声“同意”。
The beginnings of all things are small.
万事开头小。
Once the oxygen content of the air had risen to 25% it was ready to burn.
一旦氧气在空气中的含量达到25%，它就要燃烧。