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| rotating shaft | |||
| tree (A data structure containing zero or more nodes that are linked together in a hierarchy. If any nodes are present, one node is the root; each node except the root is the child of one and only one other node, and each node has zero or more nodes as children) | |||
| spindle sleeve | |||
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arvore E : 10 短语, 8 学科 |
| 信息技术 | 2 |
| 养鱼(养鱼) | 1 |
| 林业 | 1 |
| 电力牵引 | 1 |
| 电子产品 | 1 |
| 经济 | 1 |
| 自然科学 | 2 |
| 通讯 | 1 |