But the oyster has no backbone; indeed it has no bones at all.

但是牡蛎没有脊椎骨, 其实, 牡蛎连一点儿骨头都没有。

So if you describe someone as having no backbone, it means they're not a very strong person.

所以如果你形容一个人没有骨气， 那说明他不是一个很坚强的人。

So if you think literally someone has no backbone, they're going to go over like that, but this is used in a metaphorical sense, not a literal sense.

因此，如果您从字面上认为某人没有骨气， 他们就会那样过去，但这是在比喻意义上使用的， 而不是字面意义上的。