The main risk factor for shortsightedness is genetics, with a greater risk if both parents are shortsighted.

近视眼主要风险因素是遗传，具有较大的风险，如果父母是短视的。

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The significant increase of blood glucose was the main risk factor for the aggravated impairment of LV relaxation.

血糖的显著升高是舒张功能明显减退的主要危险因素。

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The age is the main risk factor for cognitive deterioration. High family relationship score is related to cognitive improvement.

增龄是认知退步的危险因素，家庭关系是认知改善的重要因素。

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Because so much is still unknown at this point, the main risk factor is people traveling to areas where cases have already been identified.

CNN: Regular flu season precautions advised in current outbreak

Iain McMillan, director of CBI Scotland, said the recovery of the US markets would be the main factor influencing exports, adding that the risk to the Scottish economy would "increase dramatically" if there was no improvement in America next year.

BBC: A factory worker

Because LDL cholesterol is a major risk factor for heart disease, it's the main focus of cholesterol-lowering treatment.

CNN: Cholesterol levels: What numbers should you aim for?