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...
期货价格在早盘深幅下跌后出现反弹，收盘时未见严重损失。Futures prices recovered from sharp early declines to end with moderate losses.我只有一次见过她大发雷霆。I saw her in a towering rage only once.我就见过他那一次，那就让我受够了。I met him only the once, and that was enough....