Using method of integral regression, effect of varying amounts per factor on annual yield and period of positive or negative effect during each growing stage of grasses were given.
用积分回归法分析了牧草生长发育各时段单位因子变化量对年产量的影响程度及正负效应时段。
Change at the annual frost-free period 100-160 days, the distribution of the trend of growing on the grounds east to west.
全年无霜期变化在100—160天之间，分布趋势为由东向西逐渐增长。
Based on Chinese official statistics, during this period of China-Africa trade fever that started in 2003, the number of Africans headed to Canton has been growing at annual rates of 30-40%.
根据中国官方统计，在此期间，中非贸易热始于2003年，一些非洲人前往广东一直在增长年增长率达到了30 - 40 %。
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