With the DM course being longer, the occurrence rate increased.

随病程延长，视神经病变发生率增加。

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The occurrence rate of jugular vein bulb at both side of OML plane was37.0%(40/108).

颈静脉球窝于双侧眶耳线平面上的总出现率为37.0%（40/108）。

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It was found that the occurrence rate, current intensity and density increase with an increasing level of geomagnetic activity.

统计结果表明，场向电流的发生率、强度和密度都随地磁活动的增加而增大。

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"We now know the rate of occurrence of habitable planets around the most common stars in our galaxy, " said Prof Charbonneau.

BBC: Exoplanets near red dwarfs suggest another Earth nearer

The study found that the occurrence of difficult-to-treat infections in U.S. hospitals mirrored the rate of antibiotic prescribing in communities served by those hospitals, generally rising during flu season and subsiding in the spring and summer months.

FORBES: Private Physicians Drive Up Antibiotic Resistance, Helped Along By Patients

"Operations Director Carlos Murrieta pointed out that we have reduced the occurrence of accidents in recent years, " Pemex said on its Twitter page, adding that its accident rate was below international standards for similar companies.

WSJ: Deadly Blast Hits Mexico Oil Giant