他专攻刑法。He specialized in criminal law.他专攻古典文学, 旁及历史.He studies classical literature , but also takes an interest in history.我将专攻地理学.I shall confine myself to the subject of geography....
Sometimes a creature uses a pair of antennae to swim.有时某些动物使用其一对触须来游泳.He tells us of lightless stars, " visible " only to radio antennae.他对我们谈起一些不发光的星星, 只有无线电天线才可以 " 看见 ".Its ears were small, cup - shaped antennae.它的耳朵很小...