英语翻译

题目

英语翻译
What those early craftmen had found by trial and error was that under pressure a pagoda's loose stack of floor could be made silther to and fro indpendent of one another.

答案

早期的手工艺者通过反复试验发现,在压力条件下宝塔松散的楼层通过前后相互依靠可以更加紧实.
貌似是这么个意思,但是silther 这个单词没查到,应该是误写了吧.
what ——引导的主语,was 后面是从句.