| 序号 | 英文主题词 | 中文主题词 | 命中文献数量（篇） |
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| 期刊 | 博硕士论文 | 会议论文 | 报纸 | 年鉴 | 成果 | 专利 | 国家标准 | 行业标准 | 标准 | 总计 | | 2541 | Pregnancy Trimester, First | 妊娠初期 | 11596 | 99 | 479 | 352 | 17 | 71 | 34 | 0 | 0 | 0 | 12648 | | 2542 | Pregnancy Trimester, Second | 妊娠中期 | 5021 | 40 | 199 | 78 | 2 | 18 | 1 | 0 | 0 | 0 | 5359 | | 2543 | Pregnancy Trimester, Third | 妊娠末期 | 6493 | 47 | 226 | 118 | 4 | 17 | 1 | 0 | 0 | 0 | 6906 | | 2544 | Pregnancy Trimesters | 妊娠三月期 | 22257 | 173 | 868 | 520 | 23 | 105 | 36 | 0 | 0 | 0 | 23982 | | 2545 | Pregnancy, Abdominal | 妊娠, 腹腔 | 1151 | 0 | 24 | 10 | 3 | 0 | 0 | 0 | 0 | 0 | 1188 | | 2546 | Pregnancy, Animal | 妊娠, 动物 | 2046 | 70 | 228 | 14 | 3 | 6 | 0 | 0 | 0 | 0 | 2367 | | 2547 | Pregnancy, Ectopic | 妊娠, 异位 | 28283 | 73 | 684 | 319 | 24 | 120 | 16 | 0 | 0 | 0 | 29519 | | 2548 | Pregnancy, Heterotopic | 妊娠, 宫内外复合 | 379 | 1 | 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 388 | | 2549 | Pregnancy, High-Risk | 妊娠, 高危 | 4392 | 7 | 120 | 313 | 56 | 18 | 0 | 0 | 0 | 0 | 4906 | | 2550 | Pregnancy, Multiple | 妊娠, 多胎 | 2756 | 21 | 119 | 37 | 1 | 6 | 0 | 0 | 0 | 0 | 2940 | | 2551 | Pregnancy, Prolonged | 妊娠, 过期 | 5154 | 7 | 88 | 36 | 1 | 6 | 0 | 0 | 0 | 0 | 5292 | | 2552 | Pregnancy, Quadruplet | 妊娠, 四胎 | 27 | 0 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 30 | | 2553 | Pregnancy, Quintuplet | 妊娠, 五胎 | 5 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | | 2554 | Pregnancy, Triplet | 妊娠, 三胎 | 133 | 0 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 138 | | 2555 | Pregnancy, Tubal | 妊娠, 输卵管 | 8547 | 29 | 206 | 61 | 4 | 43 | 1 | 0 | 0 | 0 | 8891 | | 2556 | Pregnancy, Twin | 妊娠, 双胎 | 1469 | 11 | 60 | 5 | 1 | 2 | 0 | 0 | 0 | 0 | 1548 | | 2557 | Pregnancy, Unplanned | 妊娠, 未计划 | 1593 | 2 | 42 | 8 | 0 | 1 | 0 | 0 | 0 | 0 | 1646 | | 2558 | Pregnancy, Unwanted | 妊娠, 不想要的 | 2629 | 5 | 58 | 139 | 0 | 1 | 0 | 0 | 0 | 0 | 2832 | | 2559 | Pregnancy-Associated alpha 2-Macroglobulins | 妊娠相关α2巨球蛋白 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | | 2560 | Pregnancy-Associated Plasma Protein-A | 妊娠相关血浆蛋白A | 533 | 25 | 34 | 0 | 0 | 8 | 2 | 0 | 0 | 0 | 602 |
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