unprotected

1. ADJ An unprotected person or place is not watched over or defended, and so they may be harmed or attacked. (人或地方) 未受保护的; 未设防的

The landing beaches would be unprotected. 登陆的海滩可能没有设防。

2. ADJ If something is unprotected, it is not covered or treated with anything, and so it may easily be damaged. 无保护的

Exposure of unprotected skin to the sun carries the risk of developing skin cancer. 无保护的皮肤在太阳暴晒下有患皮肤癌的危险。

3. ADJ If two people have unprotected sex, they do not use a condom to protect against sexually-transmitted diseases and pregnancy. 未用避孕套的[ADJ n]

...the dangers of unprotected sex. …未用避孕套的性行为的危险。