A diameter passes through the center of a circle.
直径从圆心穿过。
Which circle has the largest diameter?
哪个圈的直径最大？
What is diameter of turning circle?
你船旋转初径是多少？
Generally for metal circle rod-shaped, each section may have the different diameter.
一般为金属圆杆状，各段可以有不同的直径。
She drew a circle about three feet in diameter.
她画了一个直径约三英尺的圆。
Pitch diameter (d) is the diameter of the pitch circle.
节圆直径(D)：节圆直径是节圆所在圆的直径。
Pitch diameter (d) is the diameter of the pitch circle.
节圆直径(D)：节圆直径是节圆所在圆的直径。
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