middle(a)
n. an area that is approximately central within some larger region 同义词：centercentrehearteye
an intermediate part or section"A whole is that which has beginning, middle, and end"
the middle area of the human torso (usually in front) 同义词：midriffmidsection
time between the beginning and the end of a temporal period"the middle of the war"; " rain during the middle of April"
v.put in the middle adj. being neither at the beginning nor at the end in a series"the middle point on a line"
同义词：in-betweenmediate
equally distant from the extremes 同义词：center(a)halfwaymidway
of a stage in the development of a language or literature between earlier and later stages between an earlier and a later period of time"in the middle years"; " in his middle thirties"