the grooves line up with the crossbeam.

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thegrooveslineupwiththecrossbeam.thegrooveslineupwiththecrossbeam.thegrooveslineupwiththecrossbeam.g

the grooves line up with the crossbeam.
the grooves line up with the crossbeam.

the grooves line up with the crossbeam.
groove means 沟壑 惯例 crossbeam means 横梁 line up with 是与什么相一致 与什么排成一排的 意思.
这些惯例构成了···的大梁 或者是 这些沟壑与横梁的走向一致 按整篇文章意思来译吧

沟上面用横板盖着