He had been so absorbed with watching the building that he hadn't heard footsteps on the gravel path.
他留神观察那栋建筑，竟没有听见砾石路上的脚步声。
He had been so absorbed with watching the building that he hadn't heard footsteps on the gravel path.
他留神观察那栋建筑，竟没有听见砾石路上的脚步声。
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