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。
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.
评估肉眼检查在口腔癌筛查中的作用。
然后，他会对式样肉眼检查，以确保图像足够清晰。
He then makes a visual inspection of the pattern to insure that the image is sufficiently sharp.
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