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| 1. | computers.CD disk is an optical disc,on which data is recorded as a set of dips in the surface.When a laser beam |
| CD盘是一种光盘，其数据以一组坑的形式记录在光盘表面上，当激光束扫过这些坑的时候，返回的失真程度就代表了这些数据。 |
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| 2. | A beam across an opening, such as a hearth, into which the ends of joists can be fitted. |
| 托梁，承接梁穿过孔洞，如壁炉地面，到插梁末端能被固定的横梁 |
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| 3. | As the electron beam goes across the face of the picture tube, there are various little spots of light |
| 当电子束扫过显象管屏幕时，屏幕上就有许多小亮点和暗点。 |
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| 4. | When a laser beam shines across the dips, the reflected distortion represents the data. |
| cd盘是一种光盘，其数据以一组坑的形式记录在光盘表面上，当激光束扫过这些坑的时候，返回的失真程度就代表了这些数据。 |
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