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Icebergs are ordinarily blue to white, although they sometimes appear dark or opaque because they carry gravel and bits of rock.

冰山一般是蓝色到白色，尽管有时因为携带了砾石和小岩石而变成黑色或者不透明。

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Population cycles are characteristic of small mammals, and they sometimes appear to be brought about by predators.

数量的周期循环是小型哺乳动物的特征，它们有时似乎是由捕食者造成的。

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These problems may appear and then disappear, sometimes resulting in long periods when there are no problems at all.

VOA: special.2009.01.06

Sometimes, symptoms of the disease appear and then disappear for a long time.

VOA: special.2009.01.06

Sometimes,snow or ice may appear to be blue.

VOA: special.2010.01.05

Santa Fe and its locals sometimes appear in the couple's work.

WSJ: Crime (Writing) Pays: Jonathan Kellerman and Faye Kellerman's Desert Retreat

The default screen page is monopolized entirely by the text, with no title on the top and no page on the bottom -- though numbers do sometimes appear in incredibly small font in the right margin.

ENGADGET: iRiver Story HD review

He can sometimes appear arrogant and dismissive.

CNN: Bill Schneider: The final debate is all about connecting