下层由以纤维为增强材料，以树脂为基料凝固而成。
The reinforcing material of the lower layer is fiber. The lower layer is solidified by the resin, which is used as base metal.
下层由以纤维为增强材料，以树脂为基料凝固而成。
The reinforcing material of the lower layer is fiber. The lower layer is solidified by the resin, which is used as base metal.
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