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汉语拼音：tī dù

1.坡度。

2.单位时间或单位距离内某种现象（如温度、气压、密度、速度等）变化的程度。

3.依照一定次序分出的层次：考试命题要讲究题型有变化，难易有～。

4.依照一定次序分层次地：由东向西～推进。

• Across geographic gradients, Levins expects allopatric races or coenospecies exist.

  穿过地理梯度, 莱文斯预料有分布区不重叠的小种或近群种.

• The airborne magnetic gradiometer came into use in the middle 1960 s.

  航空磁梯度仪在六十年代中期交付使用.

• This indicates a hydrodynamic condition with a very marked potentiometric gradient.

  这说明水动力条件具有很明显的位能梯度.

• 4 gradient arrays marked A, B, C and D were set up.

  布置了编号为A, B, C,D的四个梯度排列.

• Examples of interactions are mass transfer caused by temperature gradient.

  温度梯度所引起的质量转移是交叉作用的例子.

• The residence gradient for lung cancer was strongest among nonsmokers.

  肺癌的居住区梯度在不吸烟者当中最大.

• There is no pressure gradient through the thickness of the film.

  贯穿流体膜厚度无压力梯度.

• The intent here is to identify the basic ingredients of gradient methods.

  本节的目的就是了解一下梯度法的基本内容.

• The resulting solution is known as the gradient.

  合成解就是通常的梯度风.

• Two main types can be distinguished: ecoclines ( clines along an ecological gradient ).

  有两个主要类型可以区分,即生态梯度变异 ( 即沿着生态梯度出现的梯度变异 ).

• The reaction rate is limited by the concentration gradient of oxygen in the sample.

  反应速率受试样中氧浓度梯度的限制.

• Main work include : 1 A method of adaptive DBF in received antenna array.

  1讨论了在接收阵列天线中,自适应数字波束形成(DBF)的方法,引入了 采样 梯度矩阵算法.

• Unconstrained optimization methods include gradient, conjugate direction, Newton, and quasi - Newton methods.

  无约束最优化方法包括梯度法 、 共轭方向法 、 牛顿法和拟牛顿法.

• Conclusion: High purity of MSC can be obtained by density gradient centrifugation.

  结论: 密度梯度离心法分离获得的人胚胎骨髓间充质干细胞纯度高.

• Standard Test Method for Density of Plastics by the Density - Gradient Technique.

  用密度梯度法测定塑料密度的试验方法.(英文版).