带负电荷的区域非常大：数百米厚，直径达几千米。
The negatively charged region is large: several hundred meters thick and several kilometers in diameter.
谷神星直径大约为960公里，是小行星带里体积最大的成员。黎明号将于2015年到达谷神星。
Ceres, at about 960km in diameter, is the largest asteroid. Dawn is due to arrive there in 2015.
各种不同直径的复合丝轧制成的超导带，都有一临界电流最高的厚度范围。
To the tapes made from composit silk with different diameter, there is a thickness range in which Jc is higher.
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