百度_浪漫厅吧_复习资料！！！ ... in charge of 负责。。。 two classroom buildings 两幢教学楼 sth. cost sb. some money 某物花了某人。。。钱 ...
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He greeted us with a mere twitch of his head.
他只晃了一下头算是和我们打过招呼。
The described how a trained seal, named Henry, was able to indicate, with a twitch of its head, whether the fish moved to the right or to the left.
一只名叫亨利的海豹经过训练，只要晃动脑袋就能察觉出鱼往左游还是往右游。
As noted, we lose muscle mass with age. Especially quick to deteriorate are fast-twitch muscle fibers, which power quick, explosive movements.
如上而言，随着年纪的增大我们的肌肉会失去力量，尤其是快速收缩的肌肉纤维更为明显，这部分纤维让我们跑得快，启动有爆发力。
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