The history of breaststroke dates back to the Stone Age.
蛙泳的历史追溯到石器时代。
It is difficult, and left behind the back to shake a coward but stepping stone bridge; also the brave forward.
困难，是动摇者和懦夫掉队回头的便桥；但也是勇敢者前进的脚踏石。
The origins of Chinese lanterns reach back to the Stone Age.
中国灯笼的起源可追溯至石器时代。
Dogs can date back to the Stone Age.
狗可以追溯到石器时代。
Foreign friends, go back, do not forget to bring back a few stone Oh!
外国朋友们，回去时，不要忘记带几个雨花石回去哦！
It dates back to the stone Age.
这要回溯到石器时代。
It dates back to the stone Age.
这要回溯到石器时代。
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