bydoing的精选

bydoingthis，theymayattimesbehelpingtorestorecompetition.这样一来，他在某些时候，有助于竞争的加强。theoldthree-bodyproblemissolvedbydoingenougharithmetic.古老的三体问题在进行充分的演算后，加以解决了。i&#39msu...