| 词汇 | earthworm |
| 释义 | earthworm noun[ C ] uk /ˈɜːθ.wɜːm/ us /ˈɝːθ.wɝːm/ a common type of worm that moves through the earth蚯蚓 motorolka/iStock/Getty Images Plus/GettyImages Worms, snails, slugs & similar animals annelid centipede echinococcus escargot flatworm gastropod hookworm leech limacine millepede minibeast nematode pill bug roly-poly roundworm slug snail woodlouse worm These included the use of earthworms to create soil nutrients, plant-oil pesticides, and predator insects to kill pests. Earthworms were not plentiful on the island. He carefully picked his way on tiptoe among the earthworms, without killing a single one. Mr. Darwin believes that traces of it can be found in earthworms and other annelids. One day my sister threw a handful of earthworms on to my dress. The constant stirring up of the soil by earthworms is an aid in keeping the soil open to air and water. earthworm | American Dictionaryearthworm noun[ C ] us/ˈɜrθ·wɜrm/ a common type of worm (= small animal with a long, narrow, soft body), that moves through the earth Examples of earthwormearthworm As a result, contemporary earthworms live in worlds that have been partly niche-constructed by many generations of ancestors. Explaining density-dependent regulation in earthworm populations using life-history analysis. Earthworm casts were negatively related to soil temperatures and positively to moisture content. Further experiments are needed to assess costs and benefits of earthworms to plants and ants, as well as to clarify vital aspects of their biology. Both species have two main transmission routes, either directly or indirectly, involving paratenic hosts such as rodents or earthworms. Variation in soil temperatures and moisture content, respectively, accounted for 97 and 96 % of the variation in earthworm casts. The third experiment investigated ant reaction to earthworm mucus. In contrast, bird's nests, female insect's oviposition site choices, and the soil transformed by earthworms also modify the environment of the constructor's descendants. However, using earthworm-specific primers, and appropriate temperature gradient conditions, species-specific bands can be resolved (fig. 5) (similar results for aphid not shown). But tunnels may also originate from the underside of the pat, mainly by the action of earthworms and insect larvae. Variation in soil temperatures and moisture content, respectively, accounted for 98 and 99 % of the variation in earthworm casts. Plots were watered as and when necessary to maintain moist surface conditions and encourage slug and earthworm activity. No earthworms were found in any of the pats. Perhaps predation by mice on the island is not confined to small animals like insects and earthworms. This simple model of earthworm population dynamics may be modified by some seasonal perturbations, leading to the appearance of one or several peaks. 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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