调查发现，2009年航空公司的整体客户满意度连续第三年下滑，创下了四年的新低。
The study finds that overall customer satisfaction with airlines in 2009 has declined for a third consecutive year to a four-year low.
这是连续第四年贫困率和上一年度相同。
It's the fourth year in a row that poverty rates were not different from the previous year.
把四次有理插值样条函数的连续性降为C2连续就可以提供额外的自由度，这对于控制曲线的形状具有较大的灵活性。
If we decrease the splines continuity to C2 continuous, it can provide additional freedom degree, and this is very useful for shape constraint in curve design.
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