例句與造句

1. There, "'w "'is a vector field, "'x "'is position ( in column vector form, for matrix multiplication purposes ), and the dot product not a real dot product but an " inner product " ( I'm not too sure of this ) in the sense that each entry of the Jacobian appears represent the ( scalar ) product of a partial derivative and a dyadic unit tensor for each unit vector pair ( according to an expert I asked ).
2. It's difficult to find unit tensor in a sentence. 用unit tensor造句挺難的