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| hollow ball | |||
| clean shot; open shot; swish; swisher | |||
| hollow sphere | |||
| 空心球: 38 phrases in 13 subjects |
| Agriculture | 1 |
| Air defense | 1 |
| Aviation | 3 |
| Basketball | 3 |
| Chemistry | 1 |
| Earth sciences | 4 |
| General | 3 |
| Metallurgy | 2 |
| Oil / petroleum | 4 |
| Polymers | 2 |
| Space | 4 |
| Technology | 9 |
| United States | 1 |
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