extensive
adj.
"vast, far-reaching;" c.1600 of immaterial, c.1700 of material things; from Late Latin extensivus, from extens-, past participle stem of Latin extendere "to stretch out, spread" (see extend). Earlier in a medical sense, "characterized by swelling" (early 15c.). Related: Extensively; extensiveness.
〔蒋〕[tend(tends，tent)=stretch伸，伸展→面积扩大→广阔，-ive形容词后缀，…的] 广阔的，广泛的