| 1. | The individual arcs cannot be rectified .
单个弧是不能求长的。 |
| 2. | A common laboratory source of light is provided by a mercury arc .
通常的实验室光源选用汞弧灯。 |
| 3. | Sectors of it represent corresponding fractions of a wavelength .
它的各个弧段则代表一个波长的相应分数。 |
| 4. | The indegree of a vertex v in d is the number of arcs with head .
VD中顶点V的入度是指以V为头的弧的数目。 |
| 5. | Rear-arc basins seem to have opening kinematics very like other chasmic basins .
弧后盆地似乎很象其他裂陷盆地那样具有张开运动 |
| 6. | If the diameter of the pupil is 6 mm the eye is able to separate 120 seconds of arc .
如果瞳孔直径为6毫米，人眼可分辨120弧秒。 |
| 7. | The crack between the coped and hole was removed by air arc and then repaired by welding .
在修割边和钻孔之间的裂纹用气弧消除，然后进行焊补。 |
| 8. | Every tournament can be transformed into a diconnected tournament by the reorientation of just one arc .
每个竞赛图只通过一条弧的改向而转变为双向连通竞赛图。 |
| 9. | Comparatively rudimentary interferometer observations suggested that this source is about 1. 5 across .
不很精确的射电干涉仪观测表明，这个源的角径约为15弧秒。 |
| 10. | A satisfactory approximation to monochromatic light can be obtained with a filter placed in front of the arc .
在碳弧前面放一个滤光片就可以得到令人满意的近单色光。 |
