原级：diameter
1. \u0064\u0061\u006E\u0063\u0069\u002E\u0039\u0031\u0031\u0063\u0068\u0061\u002E\u0063\u006F\u006D
1. The width of the track of a central eclipse varies according to the relative apparent diameters of the Sun and Moon.
2. That's considerably smaller than the moons with 12 mile diameters previously discovered in Saturn's orbit.
3. To be specific, they are measuring the diameters of tree trunks.