This leaves fertile soil unprotected and prone to erosion.这会让肥沃的土壤暴露在外，使其容易受到侵蚀。You are playing Russian roulette every time you have unprotected sex.行房时不采取避孕措施是非常危险的。Machinery was often unprotected and accidents were fre...
Exposure of unprotected skin to the sun carries the risk of developing skin cancer...皮肤没有采取任何防晒措施就在太阳下曝晒的话有得皮肤癌的危险。This leaves fertile soil unprotected and prone to erosion.这会让肥沃的土壤暴露在外，使其容易受到侵蚀。You are playing Russian r...