医生用显微镜作了血迹检查。 The doctor had a microscopic examination of traces of blood.
那只狗的毛皮上沾有血迹。 The dog's fur was matted with blood.
难道医生就不应该将杀人者杰克（残害妇女的凶犯）送交警察，律师就不应该拒绝掩盖血迹斑斑的罪证，出来指证他的当事人是残害他人的凶手吗？ Is there not a point where a doctor should hand Jack the Ripper over to the police and a lawyer refuse to suppress the bloodstained evidence that proves his client a torturer?
