“spider”的概念、定义、翻译、参考文献-科学参考

spider

Astronomy

The support of the central secondary mirror in reflecting telescopes such as Newtonians and Cassegrains. A spider generally has three or four arms which attach the secondary to the tube.

Science and Technology

A predatory, air-breathing arachnid (order Araneae) with eight legs and a body divided into two parts, a prosoma covered by a carapace, linked by a narrow pedicel to the opisthosoma (abdomen). The prosoma bears up to eight eyes, two large chelicerae (mouthparts) ending in fangs each connected to a poison gland, and pedipalps that serve different functions in different species. The opisthosoma bears spinnerets from which the spider extrudes silken thread. Most spiders feed on small arthropods, but some large species take tadpoles, small fish, nestling birds, and other vertebrates. There are two suborders, with about 114 families, 4000 genera, and 46,000 species, found worldwide except in Antarctica.
Mike Allaby

Computer

An automatic program that searches the Internet, finding new websites and producing an index of addresses and content for use in a search engine.

Internet

A program which wanders around the Internet looking for new resources such as recently released Web sites. These programs, also known as bots or wanderers, are often used by search engines, although a number of user-driven spiders can be found on shareware sites.

单词	spider
释义	spider Astronomy The support of the central secondary mirror in reflecting telescopes such as Newtonians and Cassegrains. A spider generally has three or four arms which attach the secondary to the tube. Science and Technology A predatory, air-breathing arachnid (order Araneae) with eight legs and a body divided into two parts, a prosoma covered by a carapace, linked by a narrow pedicel to the opisthosoma (abdomen). The prosoma bears up to eight eyes, two large chelicerae (mouthparts) ending in fangs each connected to a poison gland, and pedipalps that serve different functions in different species. The opisthosoma bears spinnerets from which the spider extrudes silken thread. Most spiders feed on small arthropods, but some large species take tadpoles, small fish, nestling birds, and other vertebrates. There are two suborders, with about 114 families, 4000 genera, and 46,000 species, found worldwide except in Antarctica. Mike Allaby Computer An automatic program that searches the Internet, finding new websites and producing an index of addresses and content for use in a search engine. Internet A program which wanders around the Internet looking for new resources such as recently released Web sites. These programs, also known as bots or wanderers, are often used by search engines, although a number of user-driven spiders can be found on shareware sites.
随便看	Einthoven galvanometer Einthoven, Willem EIR EIRP EIS EISA Eisele, Donn Fulton (1930–87) Eisenhower Doctrine Eisenhower, Dwight David (1890–1969) Eisenstein’s criterion EIT EJ ejaculation ejecta ejecta blanket ejection seat ejector ejournal Ekeberg, Anders Gustaf Ekman depth Ekman layer Ekman spiral Ekman transport Ekman, Vagn Walfrid ekpyrotic universe