Yīshēng tíxǐng tā, duō cì réngōng liúchǎn huì zēngjiā yǐhòu búyùn de fēngxiǎn.
The doctor warned her that repeated abortions raise the risk of infertility later on.
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人工流产 is the medical term, shortened to 人流 on clinic signs and in ads. In everyday speech people say 打胎; 堕胎 is common in writing and debate. 流产 on its own usually means a miscarriage.