Match the words from the text to their meanings.

• Объекты 1
  • filter
  • establish
  • volunteer
  • unsanitary
  • unventilated
  • in the thousands
  • around the clock
• Объекты 2
  • pass \(a liquid, gas, light, or sound\) through a device to remove unwanted material
  • set up \(an organization, system, or set of rules\) on a firm or permanent basis
  • to join the army, navy, etc without being officially told to join
  • dirty or unhealthy and therefore likely to cause disease
  • not provided with fresh air
  • in great numbers
  • all day and all night