unprotected
adj. 无保护的；未设防的；不受关税保护的
v. 无保护（unprotect 的过去分词）
例句
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。
《柯林斯英汉双解大词典》
The landing beaches would be unprotected.
登陆的海滩可能没有设防。
Machinery was often unprotected and accidents were frequent.
机器常裸露着，因此事故频仍。
《牛津词典》
