Answer:
Rainy days can make it difficult for salt makers to produce salt because the rainwater can dissolve the salt and make it difficult to collect. The process of making salt involves evaporating seawater to leave behind the salt crystals, but rainwater can interfere with this process and make it difficult to produce high-quality salt. Therefore, salt makers often need to stop working during rainy days in order to ensure that they can produce high-quality salt.