background : long-bone allograft reconstruction following tumor extirpation be complicated by problems such as nonunion at the host-allograft junction , allograft fracture , or allograft infection .背景:肿瘤切除术后异体骨移植重建可能伴有自体骨与移植物交接处和自体骨骨折,或异体骨感染。
+extirpate drug
1 . 很多毒品
the police arrested dealers in an attempt to extirpate drug aBuse .在禁毒运动中警察逮捕了很多毒品交易者。