The spacing of translational energy levels is very small.
平動的能級間隔極少.
?? 牛津釋義
spacing
n [U] amount of space left between objects, words, etc in laying or setting sth out (物體、 字詞等之間的)間隔, 間距
Be careful with your spacing or you won't get the heading on one line. 注意間隔, 否則這個標題一行排不下.
Shall I use single or double spacing (ie single or double spaces between the lines) when I type this letter? 我打這封信是用單行行距還是用雙行行距?