dass

1. that
2. (colloquial) so that

Luft

1. air, atmosphere
2. breeze, zephyr, breath

eine

• Num

  nominative/accusative feminine singular of ein

• Article
• Pron

Masse

1. mass (quantity of matter)
2. matter
3. ground

besitzt

1. inflection of besitzen: ## second/third-person singular present ## second-person plural present ## plural imperative
2. inflection of besitzen: ## second/third-person singular present ## second-person plural present ## plural imperative
3. inflection of besitzen: ## second/third-person singular present ## second-person plural present ## plural imperative

ausübt

1. inflection of ausüben: ## third-person singular dependent present ## second-person plural dependent present
2. inflection of ausüben: ## third-person singular dependent present ## second-person plural dependent present

beim

Contraction of bei dem: at the, by the, etc. (followed by a masculine or neuter singular noun in the dative case)

Tauchen

gerund of tauchen; diving