1. In three years of day and night effort, Bell figured out how to send sound over a changing electric current.
    经过三年夜以继日的努力，贝尔弄清了如何通过波动的电流传送声音。

2. It was supposed to do away with the tiring work of buttoning the many buttons on clothes of the day. But the fastener did not work well.
    人们认为这种扣件能够免除扣扣子的麻烦，因为当时的人们衣服上扣子很多，可当时的无钩扣件的性能并不理想。

3. In one English class, the 11 students spend the last five minutes in an energetic exchange evaluating their class performance for the day on a 1-10 scale.
    在一堂英语课上，11名学生用最后的五分钟展开激烈的讨论，依照1-10的评分标准相互评价他们当天的课堂表现。

4. I have never been good at guessing weight, but I know Sam feels awfully heavy when I carry him around the city all day.
    我从不擅长猜测体重，但我知道我整天抱着他在街上走时感觉他非常重。

5. If you must travel to remote areas where taxis are few, or if you plan to make many stops throughout the day, you will probably find it easier and cheaper to hire a taxi for the day or half-day.
    如果你一定要到出租车稀少的偏僻地区旅游，或者你一天中打算做多次停留，你会发现包租全天或半天的出租车更方便、更便宜。

6. If you're going to spend a lot of time with a particular driver, plan ahead to ensure the day will go smoothly.
    如果你打算和某一个司机相处好长一段时间，事先要计划好，以保证当天顺利。

7. I would leave the next day to accompany an important Chinese businessman to tourist sites in northern Thailand.
    我必须在第二天出发陪一位重要的中国商人到泰国北部的旅游点。

8. I remember the very day that I became black.
    我清楚地记得我成为黑人的那一天。

9. From now on, he will wear a suit all day and others will call him ´Mr. Bloggs´, not ´Alf´.
    从此，艾尔弗可以一天到晚穿西服了。别人将称呼他为"布洛格斯先生"，而不再叫他"艾尔弗"了。

10. For that day the master had prepared some cards on which were written, "Alsace, France; Alsace, France."
    老师专门为那一天准备了一些卡片，上面写着：“法兰西，阿尔萨斯；法兰西，阿尔萨斯。”