1. It requires 97 per cent less energy to travel the quarter of a million miles from the Moon to Earth-orbit than the 200 mile-journey from Earth´s surface into orbit!
    因此，从月球到地球的25万英里所消耗的能量要比从地球表面进入地球轨道的200英里所耗能量少97%。

2. When he went outside half an hour later, he was astonished to find that the little black lamb was almost white.
    半小时后，当他从屋里出来时，他惊奇地发现小黑羔羊全身几乎都变成白色。

3. We had been in the hat shop for half an hour and my wife was still in front of the mirror.
    我们在这家帽店已经呆了半个小时了，而我的妻子仍在镜子面前。

4. We got there after half an hour´s walk.
    走了半个小时便到达那里。

5. We all know the importance of laying a solid foundation in everything we do, and in language study perhaps more than in anything else, a good beginning is half the battle.
    我们都知道，无论做什么事，重要的是要打下坚实的基础。语言学习尤其如此。俗说话：好的开端是成功的一半。

6. When the south pole is towards the sun, the southern half of the world (or the Southern Hemisphere) is warmer, and it has its summer (December, January and February).
    当南极斜向太阳时，地球的南半部（南半球）就比较温暖，处于夏季（十二、一、二月）。

7. When that side of the moon on which the sun is shining is facing us, we see a round shining circle — a full moon.
    当月亮接受阳光照射的一面面向我们时，我们看到的是个发亮的圆盘——满月。

8. When the moon is like this, we call it a quarter moon.
    这时的月亮我们称之为半月。

9. We call this a new moon.
    我们称之新月。

10. We see the change from new moon to quarter to full and back to new moon every twenty-eight days.
    我们每二十八天就能看到从新月到半月、到满月再回到新月的变化过程。