In a message through Twitter on Christmas Day, Hefner said he had given his 24-year-old girlfriend, model Crystal Harris, an engagement ring.

在圣诞节当天，休在其Twitter 账号上声称：已经向他的24岁女友，也就是名模克里斯泰.哈里斯，赠送了订婚戒指。

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Ban notes that a crystal structure would normally mean a more refined model than the one published this week.

Ben指出，晶体结构通常指的是比本周公布的更精确完善的模型。

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The test results could be explained by the spring and dashpot model used in liquid crystal structure.

对于液晶实验结果采用弹簧-粘壶模型进行解释和讨论。

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Over the Christmas holiday, Mr Hefner announced he was to be married for the third time, to his 24-year-old girlfriend, model Crystal Harris.

BBC: Playboy accepts buyout offer from founder Hugh Hefner

For those of us annoyed with friends and colleagues repeatedly showing off their new iPhone 5 or BlackBerry 10, Vertu offers the hand-crafted Ti model with 3.7-inch sapphire crystal screen and titanium case.

FORBES: Silent Circle And Vertu Partner On $10,000 Phone

Net shoppers will buy a sofa while flipping around a crystal-clear 3-D image of their model on-screen and speaking with a salesman by PC.

FORBES: Hooked on Photonics