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| 81. | The key of the coal mining above confined aquifers is to understand the water resistion ability of the coal seam floor. |
| 承压水上采煤的关键问题是煤层底板是否能有效地阻止底板高压水突出。 |
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| 82. | sawtooth floor channeling |
| 锯形底板开槽法 |
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| 83. | deflection chassis |
| 偏转底板|扫描装置底盘 |
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| 84. | unbraced element |
| 无横向支撑组件；无支撑组件 |
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| 85. | invert elevation |
| 底板高程;底拱高程 |
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| 86. | Many actors have influence on water inrush from the floor, of them the geological conditions of the floor are the most important. |
| 底板突水与否取决于多方面影响,其中最重要的是煤层底板条件。 |
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| 87. | Something that supports weight. |
| 支撑物支撑重量的东西 |
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| 88. | To support or prop up with or as if with a long, narrow pillow or cushion. |
| 支撑如用长枕靠垫支撑或支承 |
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| 89. | held up by braces or buttresses. |
| 用带子或支撑物支撑。 |
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| 90. | unbraced structure |
| 无横向支撑结构；无支撑结构 |
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