english: However due to costs of the paraffin oil, use of such lamps is limited to the most crucial services in the evenings and at night forcing some learners not to study at all and do their homework at night.
non_english: Tuttavia, a causa dei costi elevati del kerosene , il loro utilizzo si riduce alle necessità più essenziali, la sera e la notte, costringendo parecchi studenti a saltare i propri compiti o farli in ore notturne.