plumb up the wall 使墙垂直
fetch up plumb 使保持铅直
plumb up
探究了
以上为机器翻译结果，长、整句建议使用 人工翻译 。
An Egyptian astronomer would have held up a plumb line and waited for the night sky to slowly pivot around the unmarked pole as the Earth rotated.
BBC: Pyramids lined up with the stars
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