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Language Point 36
As it swung back and forth, ...(Para. 14)
Meaning: While it moved back and forward...
back and forth: move back and go ahead or forward
A pendulum swings back and forth.
钟摆前后摆动。
He walked back and forth in his room waiting for the news from his son.
他在房间里走来走去，等候他儿子的消息。
