| 1. | Consider first a light wave spreading out from a point source . 首先考虑一个点光源发出的光波。 |
| 2. | That is, a plane refracting surface does not image all rays from a point object at the same image point . 就是说,平面折射面并不能将来自点物的所有光线都成象于同一家点。 |
| 3. | From a point about 30 metres east of its junction with 米处起,至同一交界以东约 |
| 4. | From a point about 40 metres west of its junction with 米处起,至同一交界以东约 |
| 5. | From a point about 60 metres east of its junction with 米处起,至同一交界以东约 |
| 6. | Northern kerbside lane of java road from a point about 由其与北角道交界以东约 |
| 7. | From a point about 50 metres west of its junction with 米处起,至同一交界以西约 |
| 8. | From a point about 180 metres east of its junction with 米处起,至同一交界以东约 |
| 9. | From a point about 15 metres north of its junction with 米处起,至同一交界以北约 |
| 10. | From a point about 25 metres east of its junction with 由其与茶果岭道交界处以东约 |