The spontaneous abortion rate was 0.27 %.

观察到流产率为0.27%.

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From the results of investigation, some measures of decreasing abortion rate were proposed.

根据研究结果提出了减少杉木种子败育的措施.

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The restrict of pollination is probably one of the cause of high abortion rate.

而传粉的制约很可能是造成四合木胚胎败育率极高的原因之一.

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