I'm afraid cardboard boxes are not strong enough for transport by sea.

这种纸板箱用于海运，恐怕不够结实吧。

More than 9 billion tonnes of goods and materials were transported by sea in 2012, with trade helping to lift global growth rates.

2012年，超过90亿吨的物资通过海运运输，这些贸易加快了全球增长速度。