N-COUNT [oft inNOUN]直径;对径 The diameter of a round object is the length of a straight line that can be drawn across it, passing through the middle of it. 直径;对径
...a tube less than a fifth of the diameter of a human hair.
直径不足人的头发直径1/5的电子管
...a length of 22-mm diameter steel pipe.
一段直径为 22 毫米的钢管
...a tiny capsule, between 1 and 3 millimetres in diameter.