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- Wild waterfowl are considered the natural reservoir of all influenza A viruses. 野生水鸟是甲型流感病毒的天然宿主。
- Migratory waterfowl (most notably wild ducks) are the natural reservoir of avian influenza viruses, and these birds are also the most resistant to infection. 迁移性水禽（主要是野鸭）是禽流感病毒的自然宿主，这些鸟类对感染抵抗力最强。
- The well-understood natural sulfur cycle in relation to oceanic environment, the well-known natural reservoir, is described in section 1. 第1部分阐述了已熟知的自然硫源?海洋硫循环的了解。
- This paper reviewed the characteristics of Tricholoma matutake， including its geographic distribution, natural reservoir, growth season, vegetational form, fruitbody form, perfume, and etc. 报道了四川松茸的地理分布、自然储量、发生季节、植被类型、菇体形态、色泽、香味等特点，及目前开发利用现状与存在的问题。
- E. miletuswould appear therefore to be a natural reservoir for pathogen on plague bacilli, tsutsugamushi disease and epidemic haemorrhagic fever (Korean haemorrhagic fever) viruses. 因此大绒鼠很可能成为鼠疫，恙虫病和流行性出血热等病原体的贮存宿主。
- Experts also say that many species of ducks are natural reservoirs of the virus and unlike chickens, they show no signs of disease. 专家还表示;许多种类的鸭子是病毒天然的寄主;而跟鸡不同的是;鸭子不会表现出症状.
- The pressures of population growth push people into previously uninhabited areas, disrupting the delicate equilibrium between microbes and their natural reservoirs. 人口增长的压力迫使人们进入以往无法居住的地区,破坏了微生物与其自然宿主之间的微妙平衡。
- Creating artificial seismic waves, similar to those that occur during an earthquake, could help squeeze more oil from natural reservoirs, scientists said on Wednesday. 科学家在周三说:制造出类似地震时发生的人造地震波,有助于从自然界的储备库中挤出更多的石油。
- It is natural for a cat to catch mice. 猫捉老鼠是本能。
- It's natural to slack2 off towards the end of a hard day's work. 一天紧张工作快结束的时候有些放松是自然的。
- Many natural materials are becoming scarce. 许多天然原料越来越少。
- Our motherland flows with natural resources. 我们祖国蕴藏着丰富的天然资源。
- Events took their natural course. 事态依自然进程发展。
- She has a natural wave in her hair. 她的头发自然卷曲。
- Magnetism is a natural phenomenon. 磁力是一种自然现象。
- It is difficult to be natural when one is tense. 人在紧张的时候很难泰然自若。
- Natural gas is often present in the reservoir rock. 储油岩中常有天然气。
- The egoism of an artist sometimes seem natural. 艺术家的自负有时看起来是自然的。
- They used only natural pigments to dye the wool. 他们只用天然颜料染毛织品。
- Children are natural exhibitionists. 儿童天生喜欢自我表现。
