In the near future, percutaneous AVR could be a valuable alternative for surgical high-risk patients with low-gradient, low ejection fraction AS.

在不久的将来，经皮主动脉置换可能对于外科手术中有高风险的低压力阶差、低射血分数的主动脉狭窄患者是个有价值的选择。

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They move from regions of high concentration to regions of low concentration by this natural flow down a concentration gradient.

从高浓度区域,向低浓度区域流动,顺浓度梯度流动

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During the accumulation season, sublimation is reduced because of a low gradient of vapour pressure and the energy supplied by radiation is directly consumed by melting, explaining why discharge is high.

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"The coastal gradient -- the rise of the land -- is very, very low here, " Chanton said.

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