unprotected
adjective uk/ˌʌn.prəˈtek.tɪd/ us/ˌʌn.prəˈtek.tɪd/
无防备的；未受保护的
not protected and therefore able to be harmed or damaged
Water and other liquids can stain unprotected wood surfaces. 水和其他液体会污损未加保护的木材表面。
Although some marine mammals are protected by environmental laws, many remain unprotected. 尽管有一些海洋哺乳动物受到了环境法的保护，但还有很多不在其中。
The lack of a shell leaves the larvae unprotected against predators. 没有外壳保护使这些幼虫不能抵御天敌的捕食。
unprotected sex 无防护措施的性行为，未使用避孕套的性行为
sexual activity without a condom