Objective To evaluate the clinical effect of preserving the lower first molar with complete vertical fracture.

目的评价保存治疗纵折下颌第一磨牙的临床疗效。

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Methods: The thickness of enamel and dentin at different positions of 23 upper first and 18 lower first molars were measured by electronic ruler.

方法：用电子测量尺测量23颗上颌第一磨牙和18颗下颌第一磨牙牙合面不同部位牙釉质、牙本质的厚度。

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The first real clue came when archaeologists discovered that skeletons of higher-status individuals tended to be several centimeters taller than those of people of lower states.

考古学家发现，地位较高的人的骨架往往比地位较低的人高几厘米，这是第一个真正的线索。

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American housing sales,though, have improved in recent months, helped by lower prices and a tax credit for first-time buyers.

VOA: special.2009.09.04

And even if over a period of time the average amount of their regard is lower because they started lower and then got higher than someone who was always high, it's the ones who were first lower who then went up that capture our attention.

即使在一段时间内,他们对我们的评价依然不高,但是因为起点较低,只要是在日益改善，总比一开始就对我们评价好的人更有吸引力，正是开始低而慢慢增加的人,会引起我们的注意。

耶鲁公开课 - 心理学导论课程节选

So that doesn't make a difference for us when we're talking about neutral atoms, 4s because we would fill up the 4 s first, because that's lower in energy until we fill it, and then we just keep going with the d orbitals.

所以那对我们来说没什么不同,所以当我们讨论中性原子时，因为我们会首先填充，因为在我们填充它之前它的能量都较低，然后我们继续填充d轨道。

麻省理工公开课 - 化学原理课程节选

Historically, the annual income growth for blue chippers has benefited everyone--high, middle or lower first-round picks--pretty equally.

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We said that higher fourth quarter 2012 incomes had to make for lower first quarter 2013 incomes.

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Declining clicks and missed earnings have prompted many analysts to lower their first-quarter estimates by 12 cents a share on average.

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