| 1. | Fully-grown hookworms in the gut are 2 to 3 cm long .
在肠内发育成熟的钩虫长2--3厘米。 |
| 2. | A flexible pavement has a wearing surface which is often only 5 cm thick .
柔性路面的磨耗层往往只厚5厘米。 |
| 3. | Secondary roots emerge on the 4th or 5th day about 4 or 5 cm from the root apex .
在第四或第五天，距根端大约4或5厘米处发出次生根。 |
| 4. | No concrete road surface is thinner than 10 cm since any smaller thickness might break up .
混凝土路面不能薄于10厘米，因为再薄就可能断裂。 |
| 5. | The permanent radiation of the sun would become measurable for wavelengths exceeding 20 cm .
结果是波长超过20厘米的太阳的永久辐射变得可以测量了。 |
| 6. | The image of the right face is therefore inverted(m is negative)and is a square 1 cm on a side .
因此，右侧面的像是倒立的（m为负），边长为1厘米的正方形。 |
| 7. | The primary mirror is 80 cm in diameter, a respectable size even for an observatory on the ground .
主镜的直径为80厘米，这一口径即使在地面天文台也是很可观的。 |
| 8. | we give the wavelengths of the k lines for some of the elements in table 2. 1, in units of cm.
表21中列出某些元素的K线波长，以cm为单位。 |
| 9. | these most frequently used are the angstrom unit(a.u. or =cm)and the millimicron(mμ=cm).
通常是以埃（AU或cm）和毫微米（mcm）为单位。 |
| 10. | If all the seeds germinate at one time, they can be removed for planting when the radicles are 0. 5 to 1 cm long .
如果全部种子在同一时间发芽，则当胚根长到051厘米时移出去栽植。 |
