Because visual inspection cannot reliably distinguish certain skin discolorations from skin cancers, dermatologists at clinics have needed to perform tests of skin tissue taken from patients.
由于肉眼检查不能识别某些皮肤变色和皮肤癌，诊所的皮肤科医生需要对病人的皮肤组织进行测试。
2
Of course not, say dermatologists.
让皮肤科的医生说的话，肯定不是。
3
Today dermatologists agree that the experiments were not conducted well.