雅思阅读词汇详解：生物学相关词汇　　1.
habitat n.
the natural home of a plant or animal 栖息地或产地: I prefer to see animals in their natural habitat, rather than in zoos.
　　相关语汇 　　habitation: The dilapidated hut is unfit for human habitation.
　　habitable: Their damp house is scarcely habitable.
　　uninhabitable: The planet Jupiter is uninhabitable.
　　inhabit: Woodpeckers inhabit hollow trees.
　　2.
infest v.
to be present in large numbers or to a great degree 出没于; 侵扰; 遥扰: It would be crazy to swim in these shark-infested waters.
　　近义语汇 　　swarm: The place was swarming with tourists.
　　teem: This river teems with all kinds of fish in summer.
　　overrun: The stables are overrun with rats.
　　beset: The plan was beset with difficulties from the beginning.
　　3.
lifespan n.
the average length of life of a sort of animal or plant or the time for which a material object will last 平均寿命; 遥年限: Men have a short lifespan than women.
　　相关语汇 　　life expectancy or expectation of life 预期寿命; 平均寿命: 　　Life expectancy for men is about 78 years in Japan.
　　解构分析 　　span n.
指一段时间或跨度/全长: attention span; memory span; 　　an unbroken span of concentration; The bridge crosses the river in a single span.
　　span v.
跨越/横跨; 延伸/贯穿: His interests spanned a wide range of 　　subjects.
The game has a history spanning three centuries.
故lifespan的直意为生命的跨度 　　4.
metabolism n.
the system of chemical activities by which a living thing gains power, esp.
from food 新陈代谢: The metabolism is slowed down by extreme cold.
　　同源语汇 　　metabolic: People who have inherited a low metabolic rate will gain weight.
　　metabolize: Diabetics cannot metabolize glucose properly.
　　5.
torpid a.
having lost the power of feeling or moving; lazy or inactive; moving or thinking slowly 失去活动能力的; 处于蛰伏状态的: The heat and humidity made us feel torpid.
　　近义语汇 　　lethargic: The weather made her listless and lethargic.
　　sluggish: sluggish traffic; a sluggish economy 　　dormant: During the winter the seeds lie dormant in the soil.
　　latent: These children have a huge reserve of latent talent.