药物的副作用可能导致认知发展的延缓。

Side effects of the medication may cause ___delayed cognitive development.

专业的治疗可以改善孩子的智力发育迟缓问题。

Professional therapy can help improve intellectual ___disabilities in children.

润滑不足会导致发动机性能下降。

Lack of lubrication causes ___reduced in the engine's performance.