They struggled to limit the cost by enforcing a low-tech specification.他們通過實施低技術(shù)規(guī)格拼命限制成本。The flower structure in one tree was different, enforcing cleistogamy.同一株樹上的花結(jié)構(gòu)不同, 因而閉花受精是強(qiáng)制實現(xiàn)的.The house had been cleared of every...