双曲曲面，即通常所称的负曲率，因为它的表面同时向上和向下弯曲，就像一个马鞍。
The hyperbolic surface, which has so-called negative curvature because its surface curves up and down at the same time, like a saddle.
如果水具有负折射率，那么放在玻璃杯中的吸管似乎可能弯曲到自身下方。
If water had a negative index of refraction, then a straw placed in a glass would appear to bend back under itself.
与实际制造出的负色散光纤的弯曲损耗进行了比较，结果表明理论计算得到的数据与实验数据较一致。
Based on the theoretical analysis, the bending loss curve of negative dispersion fiber was presented, being consistent with the experimental result.
为避免钢混凝土连续组合梁发生局部失稳，对负弯区钢梁腹板在弯曲应力、轴向压应力和剪应力联合作用下的力学性能进行了研究。
The mechanical behavior of steel webs with negative bending was studied with combined stress loads of flexure, axial pressure and shear to prevent local buckling in continuous composite beams.
框筒结构在水平荷载作用下的变形由剪切变形和弯曲变形两部分组成，弯曲变形必须考虑正、负剪力滞的影响。
The deformation of frame-tube structure under the lateral load is constituted by both shear and bend deflections. The effect of shear lag must be considered for the bend deflection.
图5.1（b）中的供给曲线的负斜率部分就是通常所谓的“向后弯曲”的供给曲线；
The negatively sloped portion of a supply curve like that in Figure 5.1(b) is frequently referred to as a "backward-bending" supply curve;
图5.1（b）中的供给曲线的负斜率部分就是通常所谓的“向后弯曲”的供给曲线；
The negatively sloped portion of a supply curve like that in Figure 5.1(b) is frequently referred to as a "backward-bending" supply curve;
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