| 21. | Gravity is what makes it so hard for rockets to hop off their pads and hit the moon. |
| 地心吸力是使火箭如此难于从发射坪射出，飞达月球的原因。
|
| 22. | These signs point to the gravity of the condition. |
| 这些迹象表明了事态的严重性。
|
| 23. | the law of gravity |
| 引力定律
|
| 24. | news of considerable, unusual, etc gravity |
| 相当重要, 非常重要等的新闻
|
| 25. | behave with due gravity in a court of law, at a funeral, etc |
| 在法庭, 葬礼等场合表现应有的庄重态度
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| 26. | a twinkle in his eye which belied the gravity of his demeanour |
| (他)眼睛一眨,藉以掩盖他的严肃态度
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| 27. | acceleration of gravity |
| 重力加速度
|
| 28. | attraction of gravity |
| 重力
|
| 29. | fully recognize the gravity of the situation |
| 充分认识到形势的严重性。
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| 30. | a gravity loss |
| 失重
|