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孑遗
曾经分布广泛或比较广泛,且数量和种类均很多,但随着时间推移逐渐衰退,或在重大事件特别是灭绝事件打击之后遭受重创,只有少数个体和种类孤独地生存于个别地区,并有日趋灭绝之势的生物。生物宏演化进程中的分类单元型式。
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expansion of a fraction
expansion of a function
expansion of a function in series
expansion of decreasing dimension
expansion of education
expansion of enrollment in colleges and universities
expansion of fixed assets investment
expansion of genetic code
expansion of the universe
expansion option
expansion parameter
expansion planning for electrical generating system
expansion rate
expansion ratio
expansion refrigeration
expansion rule
expansion silencer
expansion slot
Expansions on Three Theories: On Poetry
expansion test
expansion theorem
expansion thermometer
expansion time-scale
expansion tong
expansion turbine
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