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- Natural radioelement stored in the earth all material, including rocks, water, soil, flora and fauna, human itself. 天然放射性元素储存于地球上一切物质中,包括岩石、水、土壤、动植物、人体本身。
- Radium, atomic number 88, atomic weight 2260254, is a natural radioelement, elements were derived from Latin, is intended to "ray. 镭，原子序数88，原子量2260254，是一种天然放射性元素，元素名来源于拉丁文，原意是“射线”。
- If natural granite without specialized enrichment which natural radioelement material (radium, thorium, etc.) is unlikely to have acute human exposure damage. 如天然花岗石不经专门浓缩其中的天然放射性元素物质(镭、钍等)是不可能对人体产生急性照射损害的。
- 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。
- 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。
- Everything we used was made from natural materials. 我们所用的一切都是由天然材料做成的。
- It's quite natural that you should succeed. 你的成功是很自然的事情。
- He's a natural for the role of Lear. 他是李尔王这一角色的理想人选。
- Most first-class footballers are natural athletes. 多数一流的足球运动员都是天生的健将。
- Only humans have a natural upright posture. 只有人类才有自然直立的姿势。
- The area has been designated as natural reserve. 该地区已被指定为一个自然保护区。
