Contraction of front and side parts as cells die off was observed in some subjects in their thirties, but it was still not evident in some sixty and seventy-year-olds.
On this base, the formula used for calculating the side pressure of ring wall, ring tensile and temperature contraction stress is established for engineering design.
在上述基础上提出的环墙侧压力、环拉力和温度收缩应力的计算公式，可供工程设计中采用。
3
Shift your weight laterally, all the way to the other side, without lowering your body and hold an equal contraction.