7.In the First World War, the sheer volume of casualties, wounds infected because of trench mud in the pre-Penicillin era and the traumatic effect of shellfire on some soldiers were all immense challenges.
一战期间还没有青霉素,许多战士因战壕泥土而受到感染,猛烈的炮
导致伤亡惨重,给医务人员带来严峻的挑战。
「BBC 听力 2014年8月合集」评价该例句:好评差评指正