这个词是什么意思？
The visualization of tissues during pregnancy through recording of the echoes of ultrasonic waves directed into the body. The procedure may be applied with reference to the mother or the fetus and with reference to organs or the detection of maternal or fetal disease.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D016216 · MeSH 2026。
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