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| pierre angulaire | |||
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| clefd'une voûte; cle de voute | |||
| espèce clé | |||
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Keystone : 24 phrases in 10 subjects |
| Antennas and waveguides | 1 |
| Communications | 6 |
| Computers | 3 |
| Construction | 7 |
| Forestry | 1 |
| General | 1 |
| Geography | 1 |
| Information technology | 1 |
| Life sciences | 1 |
| Superconductivity | 2 |