It has become like a game of ping pong - over the years, theories have been batted back and forth as new evidence comes to light.
它变得很像一场乒乓球比赛——多年来，由于新的证据人所周知，一些理论，来来回回地讨论。
Table tennis, also known as ping-pong, is a sport in which two or four players hit a lightweight, hollow ball back and forth using table tennis rackets.
乒乓球是一项体育运动，其中两名或四名选手用乒乓球拍来回拍击一种轻便的空心球。
Table tennis, also known as ping-pong, is a sport in which two or four players hit a lightweight, hollow ball back and forth using table tennis rackets.
乒乓球是一项体育运动，其中两名或四名选手用乒乓球拍来回拍击一种轻便的空心球。
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