以下为句子列表：
英文: Methods: β-HCG were tested,the thickness and blood flow of uterine endometrium in 470 cases of very early pregnancy were tested by TVCD and compared with the last pregnant results.
中文: 目的:经阴道彩超(TVCD)检测子宫内膜厚度及其阻力指数,结合血β-HCG来更直观、更快地鉴别宫内外早早孕。
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