例句與造句

1. These imply that the spatial distributions of the different grades of the arable land , classified by the reference land unit method , reflect reasonably the spatial changes of geomorphological units and soil types . the linear estimation model between comparable productions and the corresponding quality ratings of 210 sample units shows that the coefficient of determination r2 is 0 . 876 , which means that 87 . 6 % of the change of y is explained by the change of x . it is concluded that the arable land quality ratings calcul ated by the method can reflect the biologic productivities of land
   另外，利用210個(gè)樣點(diǎn)單元的標(biāo)準(zhǔn)糧產(chǎn)量( y )與其對(duì)應(yīng)樣地法土地質(zhì)量分( x )進(jìn)行線性擬合，判定系數(shù)r ~ 2等于0 . 876的含義是指y的變異中有87 . 6是由x引起，表明了樣地法土地質(zhì)量分的高低較好地反映了耕地的生物生產(chǎn)力水平。
2. It's difficult to find sample units in a sentence. 用sample units造句挺難的
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