But the dynamic four are not just clowns . they are as deft with their musical instruments as they are with the amazing variety of objects that fly through the air . you can rest assured there will never be a dull moment when they are around 他们又最爱自创新招，四兄弟个个三头六臂，一心几用，奏乐同时又玩杂耍，我拨你的结他弦线，你按他的笛孔仍然合拍，又乐此不疲戏弄别人，总之绝无冷场，最紧要好玩！
Here , three methods are presented : shortening compensation , extending compensation and insertion compensation . this thesis also puts forward an improved dda arc interpolation algorithm , which decreases the radial deviation of the traditional algorithm without losing the original advantages 改进的dda圆弧插补算法继承了传统dda圆弧插补算法不含超越函数的优点，减少了传统dda圆弧插补算法的径向误差，实现了内外均差弦线插补。
Abstract : the curve equation , force calculation and the length of suspension in two conditions of suspended cable are given through the strict derivation using mathematical and mechanical method . the two conditions were the weight of suspension uniformly disturbed along the link and suspension line . the applications are given and the common expressions have some applied value in engineering 文摘:通过数学、力学推导，给出了悬索自重沿弦线(悬挂点连线)及沿索线均匀分布两种情况下的悬索曲线方程、受力计算及索线长度，并给出了工程应用实例，所得结论和公式具有一定的工程应用价值
The key to calculate the moistening deformation is to work out the distribution of the water content . aiming to the collapsible accidents owing of leakage , this text establishs two - dimensional immersing model of collapsible loess and predicts the change of water content in loess subsoil . furthermore the text selects the stress path method to calculate the moistening deformation subjected to leakage , substituting compressing moduls for tangent moduls after taking cavity ratio and water content into account , putting forward the method to calculate the moistening deformation 增湿变形的关键是研究含水量的变化，本文针对黄土地基由于漏水所引起的湿陷事故，建立了二维湿陷性黄土地基积水入渗模型，实现了对黄土地基含水量变化的预测，进一步选择了分层总和法计算黄土地基增湿变形，考虑了含水量、孔隙比对模量的影响，以弦线模量取代压缩模量，提出了计算增湿变形的计算方法，计算了由于漏水而引起的黄土地基增湿变形量。
