principal point
| refraction
| principal point | |
| rem.sens. | point central |
| tech. | point principal |
| refraction | |
| chem. | cassure |
| construct. | réfraction |
| microsc. | réfraction |
| nat.sc. | réfraction |
| |||
| point central | |||
| point principal | |||
| |||
| points principaux | |||
|
principal point : 10 phrases in 5 subjects |
| Cultural studies | 1 |
| Earth sciences | 4 |
| Health care | 1 |
| Hobbies and pastimes | 1 |
| Remote sensing | 3 |