| 1. | The earth is 49 times the size of the moon
地球的大小是月球的四十九倍。 |
| 2. | The earth be49 times the size of the moon
地球的大小是月球的四十九倍。 |
| 3. | The earth is 49 times the size of the moon
地球体积是月球体积的49倍。 |
| 4. | The earth is 49 times the size of the moon
地球的体积是月球的49倍。 |
| 5. | The earth is 49 times the size of the moon
地球是月球的49倍 |
| 6. | The angular size of the moon viewed from the earth is about 0 . 5
从地球看来，月球的视直径即月面最远两点的角距约为0 . 5度。 |
| 7. | Since the distance between the moon and the earth is not constant , the angular size of the moon can have a small variation
由于地球和月球的距离并不固定，所以在地球看来，月球的角大小亦会出现变化。 |
| 8. | During solar eclipse , if the angular size of the moon is larger than that of the sun , the sun will be totally covered , resulted in total solar eclipse
日食solar eclipse时太阳被月球所侵蚀与及月食lunar eclipse时月球被地影所蚕食的意思亦显而易见。 |
| 9. | Due to the tidal friction , the moon is receding from us . tens of thousand of years later , the angular size of the moon will be so small that there will be no total solar eclipse anymore
由于潮汐摩擦作用，月球正逐渐远离地球，数万年后，月球的视直径会变得很小，届时地球上便再不能看到日全食了。 |
