| 1. | Lignin is a characteristic component of secondary walls .
木质素是次生壁成份的特征。 |
| 2. | Secondary interstices develop after the rock is formed .
在岩石形成以后再发展次生间隙。 |
| 3. | These tributaries are subsequent streams which erode strike valley .
这些支流系即为蚀出走向谷的次生河。 |
| 4. | Secondary xylem consists of pitted vessels, parenchyma fibers and rays .
次生木质部由孔纹导管、薄壁组织及射线所组成。 |
| 5. | The difficulty of pinpointing primitive and derived characters remains .
要正确地指出原始性状和次生性状仍然感到困难。 |
| 6. | A strike-valley sand is deposited in the drainage course of a subsequent stream valley .
走向谷砂岩是在次生河谷水系中沉积的。 |
| 7. | 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。 |
| 8. | Light microscopy has also been useful in studies on the secondary wall of the cotton fiber .
光学显微镜还可以用来研究棉纤维的次生层。 |
| 9. | The pattern of the secondary growth of the soybean root is similar to that of most dicots .
大豆根次生生长的类型和多数双子叶植物相似。 |
| 10. | The other male gamete fuses with the secondary nucleus, forming the primary endosperm nucleus .
另一个雄配子和次生核结合形成初生胚乳核。 |
