that引导宾语从句 后面一堆做 realize的宾语that可以省去不写without overcoming those difficulties you would never know you strength,willpower or potential
是从句主语是you ,without overcoming those difficulties 是方式状语,可以放在最后的,但是 由于宾语比较长,再接他就不顺了,另外 放前面也是强调的作用