decrease byＧ短语⁵⁸¹⁶⁷ 基本例句 🌏减少了；下降了；减少了多少 However, when irrigation application decreased by25% the salt accumulation in root zone will not be obvious and the subsurface drainage flow will decrease by31.4%. 现状灌溉用水量减少25%时，作物根区没有产生明显的积盐，地下排水量减少31.4%。 cnki