它们或大或小，或空心或实心，或透明或变色。
They can be large or small, hollow or solid, clear or discolored.
陶瓷衬底可以是各种截面的空心柱体或实心柱体。
The ceramic substrate may be a hollow or solid columnar body with different cross-sections.
输出方式：空心轴输出或实心轴输出，平均效率为94%。
Output mode: hollow shaft output solid shaft output, average efficiency 94%.
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