Cast iron是“铸铁”，stomach是“胃”。这个短语是什么意思呢？请看对话：

    A: Would you like to try this? It’s our chef’s newest creation, cooked with scorpions.

    B: Sorry, but I cannot eat this type of food because I don’t have a cast-iron stomach.

    Note: Cast iron is an alloy of iron, carbon, and other elements, cast as a soft and strong, or as a hard and brittle iron, depending on the mixture and methods of molding. We use it figuratively to mean something is not subject to change or exception, like “a cast-iron rule” or something strong and hardy, like “a cast-iron stomach.” Some say the usage “cast-iron stomach” originated in French. Anyway, it’s not difficult to imagine someone with a cast-iron stomach can withstand bad food or anything nauseating.