Certain proteins help copy nucleic acids by fashioning complementary strands that carry matching nucleotides.Proteins携带配对的nucleotide参与了nucleicacids的 精确配对复制是明确的.Deoxyribose A pentose ( five - carbon ) sugar that is a comp...
为避免相撞而刹车时,他听到了轮胎与地面刺耳的摩擦声。He heard tires squeal as the car braked to avoid a collision.暴徒用一堆堆燃烧的轮胎在大街上筑起了路障。The rioters barricaded streets with piles of blazing tyres.除了给轮胎充气外,我没做过任何汽车保养。Other than blowing up a tyre I ha...
He pointed to a chair, signalling for her to sit.他指着一把椅子,示意她坐下。Private polls and embassy reports pointed to a no vote.私人民意调查和使馆报告表明投票结果将会是否决。He pointed at me with the stem of his pipe.他用烟斗柄指着我。...