The concert was a predictable yawn.果不其然，那场音乐会很乏味。She stretched her arms out and gave a great yawn.她伸了个懒腰，打了个大哈欠。Her yawn suggests that she is sleepy.她打哈欠表示她很困了。The meeting was one big yawn from start to finish.那会议自始至终十分无...
The particle - antiparticle concept is one of the most fascinating ones in physics.粒子和 反 粒子是物理学中最迷惑人的概念之一.This property, often called " helicity,'serves to differentiate the neutrino from its antiparticle.这种性质通常称为 “...