基本解释背膘同根派生 英汉例句During gestation, BW and backfat gain did not differ between treatment groups.整个妊娠期，两组间体重和背膘厚均无显著差异。Backfat is important ifreplacement females are produced within the herd.背膘厚度对于后备母猪选择是一个非常重要的指标。