upper level
英
美
- 上部水平,上水平
详细释义
形容词 upper-level:
-
at an elevated level in rank or importance
双语例句
- "A science fiction cannot not be regarded as a mere entertainment, but in fact it tells the reader much more."
"科幻小说不能简单地看成是供消遣的，而实际上它给读者展示更深刻的内容。" - An electron can drop from a higher level to a lower one with the emission of a packet of electromagnetic radiation.
利用电磁辐射束的辐射，能使电子从高能级落到低能级。
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