By means of study on velocity field constant in flue, a method used to measure average velocity of flue gas was presented.

通过对烟道“速度场常数”的研究，提出了利用速度场常数监测烟道烟气平均流速的方法，同时研制出速度场常数自动检测装置。

youdao

If you take a vector field that is a constant vector field where everything just translates then there is no divergence involved because the derivatives will be zero.

如果取的向量场是处处恒定的，所有点都是平移关系，所以没有散度，因为导数为零。

youdao

Previous experiments have shown that applying a constant electric field created small effects on flames, but Cademartiri's work used an oscillating electric field to greater effect.

过去的实验已证实，施加恒定电场于火焰上会产生较小的效应，而Cademartiri在工作中采用振荡电场得到了更显著的效应。

youdao

The one historical constant in my field is that each time a claim of human uniqueness bites the dust, other claims quickly take its place.

WSJ: The Brains of the Animal Kingdom

Barely 5ft 9ins and less than 13 stone, he's a midget in a land of giants, but what he lacks in size he more than makes up for with mouth, a constant chatterbox on and off the field, fired by a perceived sense of injustice at the way his country has been treated by the rugby elite.

BBC: Argentina's new hero

At that age, teammates play all the positions, and Martin, with a near-constant grin, was happy anywhere on the field, Mr. Calderon said.

WSJ: In Boston Neighborhood, Shock at Death of 8-Year-Old