at the foot of/at the feet of

at the foot of 是指“在……脚下”，例如 at the foot of the mountain(table, grave, statue, page)[在山脚(桌脚、墓脚、雕像脚、页脚)下]。

at the feet of 指“拜倒在……脚下”：

They fell down at the feet of their enemy. 他们向敌人屈服了。