1. Two main techniques have been used for training elephants, which we may call respectively the tough and the gentle.
    驯象有两种主要的方法，我们分别称之为强硬法和温柔法。

2. There are large advertisement signs directed at them both: the tough, confident or fashionable older man, the beautiful, "worldly" young woman, both dragging away.
    到处都有针对他们这两类人的巨大广告牌：强壮、自信或时髦、年龄较大的男人, 以及漂亮、"世故"的年青女人，都在吞云吐雾。

3. Tough question, isn't it?
    这是个棘手的问题，对不对？

4. Dragging the load uphill was tough work for the horse.
    拖货物上坡对马来说是很困难的工作。

5. "They're really tough," says Juliana Martini, who just finished her first semester.
    "他们真的很严格吶," 刚学完第一学期的朱莉安娜·马蒂尼说。

6. "Tough times never last but tough people do," as Robert Schuller says. In other words, face reality and be mature in your responses to life’s challenges.
    正如罗伯特·舒勒所说，“艰苦的时光终将过去，坚强的人必将苦尽甘来。”换言之，要正视现实，要用成熟的心态去迎接生活的挑战。