upper millstone的意思|示意

Did not a woman throw an upper millstone upon him from the wall so that he died at Thebez?

岂不是一个妇人从城墙上抛下一块上磨石来，打在他身上，他就死在提备斯么？

The lower millstone has grooves on the side touching the upper millstone.

下面的磨石在与上面磨石接触的一面有凹槽。

Didn't a woman throw an upper millstone on him from the wall, so that he died in Thebez?

岂不是一个妇人从城上抛下一块上磨石来，打在他身上，他就死在提备斯吗？