Measures against encephalitis could reduce the incidence of speechimpairment degree 1.
清洁环境、阻断脑炎传播有利于减少脑炎所致的一级言语残疾；
2
Nevertheless it may underlie the very limited ability of people with aphasia to compensate for the speechimpairment by using informative gestures.
然而，失用可以影响失语症患者利用动作代偿言语障碍。
3
Autism lies on the more severe end of the spectrum whereas Asperger's is a milder condition that doesn't involve speechimpairment (as classic autism does);