| 21. | Suddenly a beam of light flashed past their feet. |
| 突然一道光从他们脚下掠过。
|
| 22. | The light beam passes through the container holding the vapor. |
| 光束通过盛蒸气的容器。
|
| 23. | The girl lost her balance and fell off the balance beam . |
| 小女孩失去了平衡，从平衡木上摔了下来。
|
| 24. | She performed on the balance beam with much grace. |
| 她在平衡木上表演得非常优美。
|
| 25. | There is not a beam / hint of hope. |
| 一线/丝希望也没有。
|
| 26. | Her answer was on the beam . |
| 她的回答是对的．。
|
| 27. | The beam lighted the ship into the harbor. |
| 光柱指引着船进港。
|
| 28. | The gymnast performed on the balance beam with an easy grace. |
| 体操运动员在平衡木上表演得优美自如。
|
| 29. | The beam has a thickness of 4 inches. |
| 这梁厚4英寸。
|
| 30. | the beam of the torch, searchlight, etc |
| 手电筒， 探照灯等的光束
|