bend radius的用法和樣例：
例句
- Values and test criteria for meeting static and dynamic bend radii are also listed.
符合靜態和動態彎曲半徑的測試標準也已列出。 - In the previous works only the uniform wall-thickness elbows were studied.However, the elbow thickness is varied with the bending radius and ellipticity on the cross section.
以往對彎頭的研究只考慮壁厚均勻不變的情況，但是實際上彎頭的壁厚是沿著彎曲半徑變化的，並且彎頭的截面也具有一定的橢圓度。
