as hard as the nether millstone

英语新词汇与常用... ... as hard as nails 身体结实 as hard as the nether millstone 铁石心肠 as hungry as a hunter 非常饥饿 ...

这些词组的意思~_爱问知识人 ... as hard as the nether millstone 铁石心肠的 as hungry as a hunter 饥肠辘辘的 ...