| 词汇 | acorn |
| 释义 | acorn noun[ C ] uk /ˈeɪ.kɔːn/ us /ˈeɪ.kɔːrn/ an oval nut that grows on an oak tree and has an outer part shaped like a cup橡实，橡子 marcelmooij/iStock/Getty Images Plus/GettyImages Fruits & seeds & their parts ackee aronia barberry bergamot bur caryopsis chaff cone flesh peel peelings pip pith pithy poppy seed radicle radicular seed coat seed pod seedless acorn | American Dictionaryacorn noun[ C ] us/ˈeɪ·kɔrn, -kərn/ the fruit of the oak tree, consisting of an oval nut with a top shaped like a cup ACORN | Business EnglishACORN noun[ S ] uk /ˈeɪkɔːn/us abbreviation for A Classification of Residential Neighbourhoods: a system of information about how much people earn, their social class, etc. that includes all areas in the UK: A company's targeting of consumers is often based on ACORN. Examples of acornacorn Individual oak trees are non-repeatable, and so they produce acorns in order for there to be other oak trees after the original ones die. When the oblong-ellipsoid acorn reaches maturity, it acquires a brown to reddish colour and becomes detached from the cupule, so falling to the ground. The palisade parenchyma is interpreted as a barrier to desiccation of the acorn and may have a photosynthetic function during the formation of the fruit. Fully ripe acorns were obtained from the ground 15 days later. Determinations were performed in quadruplicate on batches of six acorns or seeds each time. In addition, the family also enjoyed grazing rights on the common land and the right to collect the acorn harvest. Apical structure that is essentially similar occurs in the physiologically mature acorns. A marked reduction in the mean rate of water loss was recorded for intact acorns compared with those from which the pericarp had been removed. Quantitative analysis of acorn transportation by rodents using magnetic locator. Their presence indicates a lack of activity of these vessels when the acorn reaches maturity. This area changes from green to reddish-brown when the acorn reaches maturity. Physiologically mature acorns were harvested from the tree when the pericarp started to change from green to reddish-brown. Appalachian farmers and homesteaders typically ear notched their 150-200 hogs to harvest chestnuts and acorns from the 'open range' woods26. The external surface and transverse sections of the pericarp from both mature and fully ripe acorns were examined by scanning electron microscopy. Intact acorns showed a lower rate of water loss than isolated seeds, particularly during the first 6 days of the trial. 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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