| 1. | Some bobs have a nut under them .
一些摆锤下面有螺母， |
| 2. | " 缒 " is the same as " 锤 " .
“缒”同“锤”。 |
| 3. | The time interval between drops generally ranges from 10 to 12s .
落锤的时间一般相隔10到12秒。 |
| 4. | A synchronous motor drives the measuring bob at a constant rotational speed .
同步马达驱动测锤以恒速旋转。 |
| 5. | Possibly they first found native copper and hammered it into shape .
可能他们最初找到的是生铜，把它锤击成形。 |
| 6. | The filament drive included a trailing weight and a preheater .
长丝体的传动部分包括一个拖拉重锤和一个预热器。 |
| 7. | The wheels scooped up stones which hammered ominously under the car .
车轮搅起的石块在车身下发出不吉祥的锤击声。 |
| 8. | The filament drive included a trailing weight and a preheater .
长丝体的传动部分包括：一个拖拉重锤和一个预热器。 |
| 9. | The knocker is oblong in shape, and of the kind our ancestors called "jaquemart" .
铁锤是长方形的，象古时的钟锤。 |
| 10. | The filament drive included a trailing weight and a preheater .
长丝体的传动部分包括：一个拖拉重锤，一个预热器进行加热。 |
