目睹困苦、潦倒的景象，他们感到心里极不舒服。They were sickened by the scenes of misery and degradation they found.他们在最困苦时仍处之泰然,连捉住他们的人都深有感触.The philosophy of them during their worst sufferings impressed even their captors.烈火试真金, 困苦练壮士.The fir...
I tried to imagine Dad's rough hands on this delicate instrument - and couldn't.我尽量想象爸爸那双粗手在摆弄这把精巧的小提琴 —— 可就是想象不出来.Rough hands plucked at my jacket.一双粗糙的手拽着我的上衣....
杂原子数越多, 分子被氧化的程度越高.The larger the number of heteroatoms, the more highly oxidized the molecule.关键反应为底物控制的不对称杂原子共轭加成反应.The key step was a substrate controlled asymmetric heteroatom conjugated addition.杂原子烯反应是该反应的重要组成部分.Th...