Dìyī cì tīngdào tāixīn, wǒ yǎnlèi yíxià jiù chūlái le.
The first time I heard the fetal heartbeat, the tears just came.
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Obstetrics vocabulary: 胎心 (fetal heartbeat) typically between 110-160 bpm. 胎心监护 (FHR monitoring) is the standard test during late-pregnancy checkups, sometimes abbreviated 胎监. Related: 胎动 (fetal movement), 孕检 (prenatal checkup).