The most common problem is homelessness.

无家可归成为了最为常见的问题。

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The most common problem is the Mealy bug, which feeds on plant SAP.

粉蚧是个常见的问题，它以生石花的汁液为食。

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The most common problem is bleeding and infection in the area that has been circumcised .

最常见的问题是出血和感染在该地区已割礼。

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The most common type of cholesterol problem is a high LDL (low density lipoprotein) which is usually best treated with a statin, of which there are at least four on the market.

CNN: Help me understand my cholesterol drugs

Type 2 diabetes, which is also called adult onset diabetes, is a growing problem in the Western world and is most common in the overweight and the obese.

CNN: Do vitamins help against type 2 diabetes?

Even though many use hand sanitizers after interacting with fans, teammate-to-teammate infection is the most common problem, said Granderson.

WSJ: The Yanks Need Some Chicken Soup