N-COUNT [oft inNOUN]直徑;對徑 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. 直徑;對徑
...a tube less than a fifth of the diameter of a human hair.
直徑不足人的頭發直徑1/5的電子管
...a length of 22-mm diameter steel pipe.
一段直徑爲 22 毫米的鋼管
...a tiny capsule, between 1 and 3 millimetres in diameter.