In addition to its health disadvantages, the sit-up is also seen as lacking efficiency.

Applying Study on The Effects of Cooperative Learning on Teaching of Sit-Up in Junior Girl Students of High School

合作学习法在高一女生仰卧起坐练习中的应用研究

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Some people seem to be more prone to back problems caused by sit-ups than others.

对于有些人来说，仰卧起坐似乎更容易产生腰背问题。

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When you get out of bed each morning, do five sit-ups first.

每天早上起床时先做五个仰卧起坐。

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So sit-ups might lead to back pain, but only in some people.

所以，对一部分人来说，仰卧起坐可能导致背部疼痛。

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That's fifty more sit-ups. One, two.

那得再做五十个仰卧起坐。

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Sit-ups level a slow down and down trend is obvious.

仰卧起坐水平有下降趋势并且下降趋势明显。

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Comparison and Analysis of the Punching Shear Capacity in New and Old Specifications

新旧规范中混凝土抗冲切承载力验算的对比与分析

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Stiffness Matrix Formulation of Thick Beams Based on High Order Shear Deformation Theory

按高阶理论考虑剪切变形影响的梁单元刚度矩阵

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Twin shear stress three parameter criterion and its corner model

双剪应力三参数准则及其角隅模型

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Study on direct soil shear test automatically

土直剪试验自动化的研究

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Experiment Analysis for Shear Break of Aluminum Alloy Material

铝合金材料剪切断裂实验分析

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Effects of Shear Plane Boundary Condition on Depth of Surface Work hardening

剪切面边界条件对工件表面层加工硬化深度的影响

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Research on calculation of shear strength of steel fibre reinforced concrete beams

配筋钢纤维混凝土梁抗剪强度计算方法的研究

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Quality control measures of big assembled steel formwork in shear wall structure

拼装式大钢模板在剪力墙结构中的质量控制措施

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New strength criterion for rock with shear failure mode

剪切破坏模式下岩石的强度准则

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Quality and cost control in plain concrete shear wall construction of high-rise building

高层建筑清水混凝土剪力墙质量成本控制

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Simulation of the Deformation of the Endothelial Cell Under a Shear Flow

剪切流动下内皮细胞变形的模拟

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Relation between shear parameters c φ and stress state and its application in engineering

抗剪参数cφ与应力状态的关系及工程应用

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Failure Analysis and Improvement Measures for Multiple Flying Shear of Unit 260

260机组倍尺飞剪故障分析及改进措施

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Calculation of average shear rate in pipe flow based on energy dissipation rate

利用能量耗散率计算管流的平均剪切率

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