| 1. | Their seat of reason is not a concrete .
他们的理智的基础并不牢固。 |
| 2. | Their marriage has been on shaky ground .
他们的婚姻一直不牢固。 |
| 3. | The oxygen hood is a clear, sturdy dome;
氧气头盔是一个透明而牢固的圆顶帽。 |
| 4. | The teeth were firmly cemented in their sockets .
牙齿被牢固地粘合在其孔窝内。 |
| 5. | The lorry 's load had been securely strapped down .
卡车上的货物已捆扎牢固了。 |
| 6. | This house stands on firm ground .
这房子地基牢固。 |
| 7. | Fences must be sturdy, tight .
围篱必须牢固耐用。 |
| 8. | The binding is sober and solid .
装订朴素而牢固。 |
| 9. | A small residue is retained tenaciously by the surface .
少量的残留物被表面牢固地保留着。 |
| 10. | He presses the rubber stopper firmly down on the vent .
他使橡胶塞牢固地塞进盖上的排气孔。 |
