Cartons are comparatively light, and therefore easy to handle. they 'll not be stowed away with the heavy cargo. besides, we' ll reinforce the cartons with metal straps.
李：纸板箱比较轻，所以便于搬运。纸板箱不会和笨重货物堆放在一起。另外我们会用铁皮条来加固纸板箱的。
But these joined methods can not satisfy the requirement of the heavy load wagon because of the shortcoming and self limit, therefore needs adopt the new way of joining.
但是这些连接方法由于自身的缺点和局限性，不能满足重载货车的要求，因此需要采用新型的连接方式。
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