儿童在能说或能听懂语言之前,很久就会通过面部表情和靠发出噪声来与人交流了。
15. Thanks to modern irrigation, crops now grow abundantly in areas where once nothing but cacti and sagebrush could live.
受当代灌溉之赐,农作物在原来只有仙人掌和荞属科植物才能生存的地方旺盛的生长。
16. The development of mechanical timepieces spurred the search for more accurate sundials with which to regulate them.
机械计时器的发展促使人们寻求更精确的日晷,以便校准机械计时器。
17. Anthropology is a science in that anthropologists use a rigorous set of methods and techniques to document observations that can be checked by others.
人类学是一门科学,因为人类学家采用一整套强有力的方法和技术来记录观测结果,而这样记录下来的观测结果是供他人核查的。
18. Fungi are important in the process of decay, which returns ingredients to the soil, enhances soil fertility, and decomposes animal debris.
真菌在腐化过程中十分重要,而腐化过程将化学物质回馈于土壤,提高其肥力,并分解动物粪便。
19. When it is struck, a tuning fork produces an almost pure tone, retaining its pitch over a long period of time.
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2016-02-29
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