Objective To evaluate the validity and reliabity of screening test of occult blood bead detector on esophageal cancer and gastric cancer.
目的评价隐血珠对食管癌、胃癌 筛查试验的真实性和可靠性。
It pierced her soft brown skin, and a bead of bright blood welled up.
爪尖刺破了公主柔嫩的棕色皮肤，一滴鲜亮的血珠涌了出来。
Rizzoli pulled her hand from the wound. In her gloved palm wascupped a tiny clot of blood, like a bright red bead.
芮黎真把手拿出来，手掌上握着一个小小的血块。
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