Water and other liquids can stain unprotected wood surfaces.水和其他液體會污損未加保護的木材表面。
Although some marine mammals are protected by environmental laws, many remain unprotected.盡管有一些海洋哺乳動物受到了環境法的保護,但還有很多不在其中。
The lack of a shell leaves the larvae unprotected against predators.沒有外殼保護使這些幼蟲不能抵禦天敵的捕食。