1. | 直径;对径a straight line going from one side of a circle or any other round object to the other side, passing through the centre |
the diameter of a tree trunk 树干的直径 | |
The dome is 42.3 metres in diameter . 这个穹顶直径为 42.3 米。 |
2. | 放大率;放大倍数a measurement of the power of an instrument to magnify sth |
a lens magnifying 300 diameters(= making sth look 300 times larger than it really is) 放大 300 倍的透镜 |