It never rusts or tarnishes.它从不生锈，也不会失去光泽。Copper nails are better than iron nails because the iron rusts.铜钉比铁钉好，因为铁会生锈。The axenic culture of rusts has been achieved on various defined media.在各种规定的培养基上可得到锈菌的单体纯净培养物....
孩子生病时我陷入了绝望的深渊之中。I was in the depths of despair when the baby was sick.他们常常陷入孤独、屈辱和绝望的深渊。They frequently plumb the depths of loneliness, humiliation and despair.她发出了绝望的叫声。She uttered a cry of despair....
单程票的价格是39英镑。The price of a single ticket is thirty-nine pounds.他们有足够的钱买单程票。They had enough cash for a one-way ticket.我买了一张去伯明翰的单程票.I got a single to Birmingham....