21.   Cities should make better use of land within their existing boundaries for construction and refrain from expanding onto surrounding farmland.

a. + farmland >>共 158
fertile 6.42%
surrounding 5.87%
rich 5.03%
rolling 4.75%
valuable 2.23%
productive 2.23%
lush 1.96%
prime 1.96%
flat 1.96%
idle 1.96%
surrounding + n. >>共 558
area 16.96%
village 5.85%
hill 4.74%
community 3.41%
street 3.15%
region 3.01%
countryside 2.87%
mountain 2.73%
neighborhood 2.50%
building 2.39%
farmland 0.60%
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