radiation
/ˌreɪdɪˈeɪʃn; ˌredɪ`eʃən/ n
1 [U]
(a) (the sending out of) heat, energy, etc in the form of rays （热、 能等的）放射; 辐射的热、 能等
a combination of radiation and convection, eg in a gas fire 辐射和对流的结合（如在煤气炉中）.
(b) (the sending out of) rays and atomic particles from radioactive substances （自放射性物质中放射出的）射线和原子粒子; 放射; 放射现象
a low/high level of radiation 低[高]强度辐射
[attrib 作定语]
Some cancers are treated by radiation therapy. 有些癌症可用放射疗法治疗.
2 [C] thing that is radiated, esp radioactive particles 放射物; （尤指）放射性微粒, 放射线
radiations emitted by an X-ray machine X射线机放射出来的放射线.