| 词汇 | frond |
| 释义 | frond noun[ C ] biology specializeduk /frɒnd/ us /frɑːnd/ a long, thin leaf of a plant: 窄长的叶子 Ferns and palms have fronds.蕨类植物和棕榈树都长有窄长的叶子。 Dewin ' Indew/iStock/Getty Images Plus/GettyImages Parts of plants axil bark bilobed blade bulb caning cascara sagrada corolla endodermis inflorescence knot pistil rooty rosella seed coat seed pod sessile sting taproot tubule frond | American Dictionaryfrond noun[ C ] us/frɑnd/ a large, usually divided, leaf, esp. of a fern or palm tree Examples of frondfrond We interpret the flexure as a taphonomic feature related to flattening, which arguably is supporting evidence for the frond being trough-shaped in life. Many of the bennettitalean fronds had well-preserved regions of cuticle. A fragment of the three-dimensional cast of another frond is seen adhered to the right-hand side of the mould. Following the 1991 drought, the number of fronds remaining on each palm and the percentage of dead palms were also recorded. The crescentic appearance of the fronds and the featureless median zone in the holotype have resulted from deep weathering of the specimen. Composite moulding of the frond suggests that the quilt boundaries correspond to structures stiff enough to press through the integument. The character of the secondary subdivision is similar to the primary quilting of the frond, and this is repeated in the thirdorder quilting. This finding suggests that falling fronds alone did not have a main effect on sapling damage. Another frond is compressed laterally and preserved as a wedge-shaped three-dimensional cast. Previous account of there being four fronds also cannot be confirmed. The structure of the sheath may have been delicate and seldom preserved unless sediment penetrated and moulded the space between the fronds and the sheath. The number of green fronds per tree has not yet been studied systematically. The fern fronds must have been significantly larger than the small fragments that we find preserved. This inversion can be explained as differential collapse of quilts from either side of a double-layered frond. The frond is bilaterally symmetrical; there is, however, a slight deviation in the disposition of quilts. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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