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| capping; cell cap | |||
| cap | |||
| opercle (operculum); operculum | |||
| aptychus | |||
| |||
| gill cover; gill lid | |||
| |||
| to cap; seal; cap | |||
|
opercule : 34 phrases in 10 subjects |
| Agriculture | 9 |
| Chemistry | 3 |
| Construction | 3 |
| Life sciences | 3 |
| Mechanic engineering | 2 |
| Medical | 5 |
| Natural resourses and wildlife conservation | 1 |
| Paleontology | 1 |
| Technology | 5 |
| Transport | 2 |