extenuate
词根词缀：
attenuate v. 使变薄
at 加强 + tenu 细，薄 + ate 使… → 使变薄
extenuate v. 减轻
ex 加强 + tenu 细，薄 + ate 做，造成，使… →〔把重罪〕弄轻 → 减轻〔罪行〕
extenuating adj. 掩盖罪行的
extenuat〔e〕减轻 + ing 正…的，令人…的 → 掩盖罪行的
tenuity n. 细，薄
tenu 细，薄 + ity 具备某种性质，状况 → 细，薄
tenuous adj. 细的
tenu 细，薄 + ous …的 → 细的
数据来源：新东方英语词汇速记大全
相关例句：
It is in vain, sir, to extenuate the matter.
诸位啊，掩饰这一切都是徒劳的。
He thought it necessary to extenuate the length of time he kept the dinner on the table.
他认为必须解释一下为何把晚餐留在桌上那么久。
Nothing can extenuate such appalling behavior.
这种骇人听闻的行径罪不可恕。
After oral administration, BPs significantly improved pathological injury. Inflammation were reduced, alveolar hemorrhage were extenuate, alveolar wall and inflammatory cell infiltration were decreased.
口服给药后，柴胡明显改善了病理损伤，病理切片显示给药后炎症程度明显减轻，肺泡腔出血明显减少，肺泡壁变薄，炎性细胞浸润减少。
Conclusion Integrated Chinese and Western medicine treatment of mesangial proliferative glomerulonephritis could extenuate markedly the recurrence rate of disease and the sideeffect of prednisone.
结论中西医结合治疗激素敏感型系膜增生性肾炎，可以明显减少复发率及强的松的副作用。
And in the design of the additional layer of the noise-damping tower, the light-weight steel framework, the light-weight wall body and the rubber isolating layer are adopted to extenuate the shaking.
在加层设计中，有效地运用了轻钢结构体系、轻质墙体和橡胶垫隔震层来减轻震动的作用。