The level of severity and differ from person to person. But it is usually seriously disabling.

MS会导致言语和运动障碍，其严重程度因人而异，但一般都算是重度残疾了。

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The level of severity can differ from person to person. But it is usually seriously disabling .

此病的严重程度因人而异，但通常它都会造成严重的瘫痪。

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However, WHO has not required a set level of severity as part of its criteria for declaring a pandemic.

但世卫组织并没有要求必须达到某种程度的严重性才能宣布已暴发大流行。

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One of Grove's frustrations is the standard test neurologists use to measure a patient's level of severity of Parkinson's.

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In the airline industry, mechanical problems are immediately reported and planes are quickly taken out of service depending on the level of severity.

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The biggest tornado that struck Granbury was a Category 4, with estimated winds of 160 to 175 miles per hour, Mr. Wiley said, adding that only about 10 to 12 storms reach that level of severity in the U.S. each year.

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