最终结果表明，通过改变文丘里管直径、加装直导流板或弯曲导流板均可以将流场调节均匀，达到理想状态。
Final results indicate that the flow fields in the tower can be adjusted to an ideal state by changing the diameters of the Venturi tubes, fixing the straight rectifying plates or curved shape plates.
某机械产品中a零件受年龄及环境因素影响，直径发生变化，最终无法继续使用。
The changing of the diameter of part a in mechanical products due to the influences of environment and age, and it would finally result in the uselessness of part a.
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