I'm specializing in differential and integral calculus.我正专攻微分学和积分学.Thus, specializing in pain made no more sense than specializing in fever.因此, 专门研究疼痛与专门研究发烧的意义差不多.Theorists specializing in stellar interiors were tu...
我被要求伸展手臂，收紧胸肌。I was required to hold out my arms and flex my pectorals.那位裁缝在衣服的腰部打褶收紧.The dressmaker gathered the cloth to the narrowest part of the waist.收紧肌肉,然后起跳.Gather up your muscles and jump....