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The modal tests of PCB and PCB assembly (free boundary condition and fixed boundary condition) were carried out. The equivalent elastic modulus and damping parameters of PCB can be gained, and the fixed boundary condition of finite element model was also determined. These will help to the following work. Second, drop impact tests of three different heights were carried out. Strains and acceleration responses of PCB were measured. Failed BGA packages of different test conditions were dyeing, and cross section analysis of failed solder joints was conducted. It was found in our drop tests that the root cause of lead-free solder joints under drop impact was the combined effect of mechanical shock and PCB bending vibration.

针对JEDEC标准试件的局限性，提出了设计便于统计学研究焊点可靠性的试验试件的构想，利用有限元模态分析方法确定并验证了用圆形PCB组件替代JEDEC标准试件的可行性；通过一系列模态试验和有限元模态分析，确定了圆形PCB组件的相关试验参数，这不仅为跌落碰撞下PCB组件有限元模拟确定了较为合理准确的有限元模型，而且为正确地评价跌落碰撞下PCB组件的可靠性问题奠定了基础。

This article also points out that"existence of squares","Out-In Complementary Principle","the principle of limit","Liu-Zu cross -section princeple","the area formula for rectangle and the volume formula for cuboid" determine the nature and lay the foundation of geometry in ancient China.

提出了我国古代论证几何所依据的原始命题，指出"存在正方形"连同"出入相补原理"、"极限原理"、"刘－祖截面原理"以及长方形面积公式和长方体体积公式确定了我国古代几何的性质，奠定了我国古代几何的基础。

During the 26th Antarctic expedition to study deep ice core drilling team will carry out the preparatory work, in the Kunlun station to build a deep ice core drilling site, while continuing to carry out the Zhongshan Station-Dome A cross-section of glaciology observations, Dome A site measurement of the Hong Kong Observatory and astronomical observations and mapping study visits, and will complete the second phase of the Kunlun station, including the installation and commissioning of sewage treatment and other equipment.

第26次南极考察期间，考察队员将进行深冰芯钻探的前期准备工作，在昆仑站构筑深冰芯钻探的场地，同时继续开展中山站-Dome A断面的冰川学观测、Dome A天文台址测量和天文观测以及测绘学考察，并将完成昆仑站的二期工程，包括安装调试污水处理等设备。

During the 26th Antarctic expedition to study deep ice core drilling team will carry out preparatory work, in the Kunlun station to build a deep ice core drilling site, while continuing to carry out from Zhongshan Station to Dome A cross-section of glaciology observations, the Hong Kong Observatory Dome A site measurements and astronomical observations and mapping study visits, and will complete the second phase of the Kunlun station, including the installation and commissioning of sewage treatment and other equipment.

第26次南极考察期间，考察队员将进行深冰芯钻探的前期准备工作，在昆仑站构筑深冰芯钻探的场地，同时继续开展中山站至冰穹A断面的冰川学观测、冰穹A天文台址测量和天文观测以及测绘学考察，并将完成昆仑站的二期工程，包括安装调试污水处理等设备。

Therefore,the paper clearly pointed out that the way out for the next developing cross hole seismic exploration lies in controlling the incident angle of ray within critical angle and ensuring the source to have sufficient energy.

据此，文中明确指出了今后发展井间地震勘探工作的出路在于将射线的入射角控制在临界角以内并保证震源有足够的能量。

The testing, answering system was developed out by the ASP.net. Two test papers were abstracted from the system by the combination of the certain proportion and binominal distribution mathematical models stragety. The two test papers were tested by 52 students through the cross design. The difficulty and discrimination of items and the reliability and validity of the test papers were worked out with Education Statistics, factor analysis, relative analysis etc.

运用ASP.net技术开发了组卷、答卷、阅卷系统，应用重点等级定额比例分配与难度等级二项分布数学模型相结合的组卷策略随机抽出2套试卷，采用交叉设计对52名预防医学本科学生进行测试，用教育测量学原理、因子分析、相关性分析等方法分析两套试卷试题的难度、区分度和试卷的信度、效度。

The rainy Season was in the mean Time upon me, when I kept more within Doors than at other Times; so I had stow'd our new Vessel as secure as we could, bringing her up into the Creek, where as I said, in the Beginning I landed my Rafts from the Ship, and haling her up to the Shore, at high Water mark, I made my Man Friday dig a little Dock, just big enough to hold her, and just deep enough to give her Water enough to fleet in; and then when the Tide was out, we made a strong Dam cross the End of it, to keep the Water out; and so she lay dry, as to the Tide from the Sea; and to keep the Rain off, we laid a great many Boughs of Trees, so thick, that she was as well thatch'd as a House; and thus we waited for the Month of November and December, in which I design'd to make my Adventure.

雨季快到了，那时我们大部分时间都只好呆在家里，为此，我得先把我们的新船放置妥当。我把船移到从前卸木排的那条小河里，并趁涨潮时把它拖到岸上。我又叫星期五在那里挖了一个小小的船坞，宽度刚好能容得下小船，深度刚好在把水放进来后能把船浮起来。然后，趁退潮后，我们又在船坞口筑了一道坚固的堤坝挡住海水。这样，即使潮水上涨，也不会浸没小船。为了遮住雨水，我们又在船上面放了许多树枝，密密层层地堆了好几层，看上去像个茅草屋的屋顶。就这样，我们等候着十一月和十二月的到来：那是我准备冒险的日期。

Those of you who hang out on IRC or were able to read between the lines in the various blogs, forums, wikis and twitters may realize that we - and importantly, that's a that's a collective, cross-team "we":- had been hoping to hold onto this full ipt2g jailbreak until the next version of the iPhone came out.

那些坚守在IRC或者其他任何blog、论坛、wiki和twitter的朋友们，你们应该明白我们（重要：是那个来自各地的团队--&我们&）一直被认为无法在下一代iPhone出现之前破解iPod Touch 2G。幸运的是，这并没有发生--我们依然成功破解了它。

Set out 接不定式:He set out to break the record for the cross-channel swim.

他动身游过海峡以打破记录。

About 90 percent of cross dressers are heterosexual (this statistic is pointed out in most encyclopedias) but the are not visible because they are too scared to "come out" and be seen.

大约90%的CD者是异性恋者---在大多数的百科全书中都有这个统计数字---但是，看不见这些CD者，因为他们太胆怯，不敢&走出来&被人看见。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失