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| 51. | electric spark drill |
| 电火花钻井 |
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| 52. | spark frequency |
| 火花频率 |
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| 53. | spark photography |
| 闪光照像 |
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| 54. | electric spark machinery |
| 电火花加工机床 |
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| 55. | spark sintering |
| 放电烧结 |
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| 56. | A spark gap. |
| 火花隙 |
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| 57. | spark suppression |
| 火花抑制 |
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| 58. | electric spark drilling |
| 电火花穿孔 |
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| 59. | a spark of interest; a spark of decency. |
| 我们试着他的聪明才智。 |
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| 60. | electrical spark alloying |
| 电火花冶制合金 |
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