您要查找的是不是：
- Radioactive ray is material thing. 放射线是实际的物质。
- Radium and uranium are radioactive elements. 镭和铀是放射性元素。
- He vainly tried to mark the defacing stain out. 他试图除去有损外观的污迹，但没有成功。
- A certain discharge of possible radioactive effluent. 一定量的可能有放射性的废水。
- Her school work isn't quite up to the mark. 她的功课不大符合要求。
- That was just a lot of hot air what Mark said. 马克所说的不过是一大堆空话。
- War has left its mark on the country. 战争给该国留下了不可磨灭的痕迹。
- The public scandal left a black mark on his career. 这一尽人皆知的丑闻给他的事业留下了污点。
- radioactive marke 放射性标记物
- How much do you know about the works of Mark Twin. 马克。吐温写的作品你知道多少？
- A radioactive isotope of carbon, especially carbon 14. 放射性碳碳的一种放射性同位素，尤指碳14。
- Happy anniversary, Helen and Mark! 海伦、马克，祝你们结婚周年快乐！
- Mark and Barbara are going together now. 马克与巴巴拉现在正在谈恋爱。
- Mark has lost his job and is worse off than ever. 马克的工作丢了，情况比以前更糟。
- A naturally occurring or artificially produced radioactive element. 放射性元素自然产生或人为制造的放射性元素
- A radioactive compound used in radiotherapy or diagnosis. 放射性药剂一种用于放射性治疗或诊断的放射性化合物
- He rubbed out the mark on his book. 他把他书上的记号擦掉了。
- The immediate product of the radioactive decay of an element. 继承元素某种元素放射性衰变的直接产物
- Has she ever written a letter to Mark? 她曾经写信给马克吗？
- Isotopes that emit radioactive particles; a stove emitting heat. 发射出放射性粒子的同位素; 发出热量的炉子
