它们也可用外晶体材料，例如玻璃、赛璐珞或透明塑料等制造。

They may also be manufactured from non-crystalline materials such as glass, cellophane or transparent plastics.

youdao

它们也可用外晶体材料，例如玻璃、赛璐珞或透明塑料等制造。

They may also be manufactured from non-crystalline materials such as glass, cellophane or transparent plastics.

youdao