adj. unsubstantial ; insecure ; insubstantial
黏土和砂岩都是不坚固的岩石构造。
那是一个不坚固的纸箱。
不坚固的房子容易在地震中倒塌,但坚固的房子也许能保住。
Weak buildings will fall down in an earthquake, but strong ones may stay up.
If you multiply her, then you want to have as much depth to fill in behind to close that hole as you can, so that that would make your phalanx more sturdy, because you could take more casualties without breaking, that seems reasonable to me.
如果再多一些,你就需要在后面增加足够的排数,尽可能地填补缺口,这会使你的方阵固若金汤,即使伤亡惨重也不影响阵容的坚固,这在我看来是合理的
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