The awareness of early signs and symptoms (such as cervical, breast and oral cancers) in order to facilitate diagnosis and treatment before the disease becomes advanced.
注意早期体征和症状（例如对宫颈癌、乳腺癌和口腔癌），以便在疾病进入晚期之前促进诊断和治疗。
Once the advanced signs have developed, no treatment has been shown to improve the ewe 's chances of survival.
严重病状一旦发生，就没有疗法可提高母羊的生存机会。
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