I twist my neck, trying to catch her expression, but I can see only half of it: flutter of eye, curve of lip, and slice of cheek.

我扭转脖子，想看看她的表情，可也只能看到一半儿：眼睛的煽动、嘴唇的弧度，面颊的一片儿。

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Half the pie is the genetic set point. The smallest slice is circumstances, which explain only about 10 percent of people's differences in happiness.

这块蛋糕的一半就是遗传设定好的那一半，而最小的那一片蛋糕表示的是环境因素，说明人们幸福感的差别有10%是由环境决定的。

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So, if you slice these things by a vertical plane, or actually even better, a vertical half plane, something to delete one half of the picture.

如果你画个切面是垂直的，或者是更好的垂直半平面，我们擦掉这半边。

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Hamilton swapped the lead with his team-mate Kovalainen before Buemi moved into top spot and then proceeded to slice more than half a second from his own time.

BBC: Kovalainen top as McLaren shine

With the same knife, slice each layer horizontally in half.

NPR: Recipe: Devil's Food White-Out Cake

However, the biggest slice of funding, more than half, is coming from the Tourist Board and the Department of Trade and Investment (DETI).

BBC: Titanic project faces EU grant shortfall