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1.三年级的学生做一年级的算术题,是很0N.{-[-h:[8U1])P,C)H3x的。7}0E+h0j'K0\)e0]5P-T0V1u
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研究 研制7}0E+h0j'K0\)e0]5P-T0V1u
3.飞机设计师+O(~6O0S:Y6c6W+f(j(j-T5M出了具有各种优良性能的飞机。7}0E+h0j'K0\)e0]5P-T0V1u
4.科学家认真.k/`-}.X了鸟类飞行的原理。7}0E+h0j'K0\)e0]5P-T0V1u