The three main reasons are lack of competitive pressure, a tendency to reinvent the wheel and a focus on technology rather than organisation.
这有三个主要的原因：缺少竞争压力、重复建设及注重科技而非管理。
2
The results show that, with an increasing internal pressure, non-circularity of the tube decreases, and the tendency of thickness thinning on inner and out side of the tube increases.
结果表明，随着充液压力的增大，截面不圆度逐渐减小，管材内侧壁厚增厚趋势减小，外侧减薄趋势增大。
3
Cold weather is another contributor because it can boost blood pressure, interrupt blood flow to part of the heart, and increase the tendency for blood clots to form.