Part III: cage and the birds who eat the most value can be Liuniao part of civil wood, bone, ceramic artist co-crystallization of the art.
第三部分：鸟笼和鸟食罐是遛鸟人最为看重的组成部分，是民间木雕、骨雕、陶瓷艺人共同的艺术结晶。
The pre-failure of the cage is the main cause leading to the decrease of domestic ceramic ball bearing life.
经分析，导致国产混合陶瓷球轴承使用寿命下降的主要原因是保持架的提前失效。
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