18.The hospitals have been overwhelmed by hundreds of injured and the risk of infection for the wounded is high in the abject and unsanitary conditions.
19.They surrounded the whole area with a three-metre wall topped with barbed wire and stopped food supplies from entering, trapping everyone in overcrowded and unsanitary conditions.
20.During these six months, despite the unsanitary conditions and unfamiliar climate, Pershing learned as much from the Japanese about modern warfare as he could.