| 词汇 | tropic |
| 释义 | tropic noun geography, environmentuk /ˈtrɒp.ɪk/ us /ˈtrɑː.pɪk/ [ C ] one of the two imaginary lines around the earth at approximately 23.5 degrees north and 23.5 degrees south of the equator回归线 the tropics[ plural ] the hottest area of the earth, between the Tropic of Cancer and the Tropic of Capricorn: 热带地区 She's a botanist and spent several years doing research in the tropics.她是个植物学家，花了几年时间在热带地区做研究。 Countries, nationalities & continents: continents & regions of the world Afrocentric Afrocentrism amazonian Antarctica Antipodean black Africa Caribbean interhemispheric Lapland LATAM Latin America meridian parallel pole the Antipodes the International Date Line the Pacific Rim the South Pole the subtropics the Tropic of Cancer Examples of tropictropic In some highly fragile environments, found most often in the tropics, soils may be highly vulnerable to rapid and irreversible degradation with inappropriate agricultural practices. Although the focus of this proposition is the developing world tropics, problems with agricultural development in semi-arid regions are not confined to the developing world. Elsewhere, and especially in the semi-arid tropics where climate is much harsher, more ®ckle and more extreme, life has always been far tougher. Genetic improvement of selected vegetables for the tropics and subtropics. All a re below 200 m i n elevation, a nd temperatures a re typical of the lowland tropics. Emerging paradigms of tree phenology in dry tropics. Shading improved dry-season survival while competition for moisture had significant effects on seedling performance compared with tree seedlings in the humid tropics. Successful establishment of seedlings in the dry tropics is dependent mainly upon moisture availability. Therefore, soil moisture conservation is crucial for maintaining soil biological processes in smallholder cropping systems, especially in sub-humid and semi-arid tropics. Low soil water availability decreases decomposition rates in the dry sub-humid and semi-arid tropics despite their higher temperatures. Parasitic organisms are found in almost every environment ranging from the extremes of cold conditions in the polar regions to hot climates in the tropics. Maesopsis continues to be introduced as a rapid-growing timber species in plantations throughout the tropics. In the nineteenth century some people in the tropics took opium believing that it would be effective against malaria. In the tropics, for example, age determination on a broad scale - especially with so many species, is simply beyond the reasonable reach of analysts. Both traits showed geographic variation and strong non-linear clines with a sharp reduction in size in the tropics. See all examples of tropic 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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