The private ships in those days (partaking in private foreign trade) as typified by the wako (Japanese pirates) carried out trade in such a rough way that it caused a weakening of the Yuan dynasty which could not be overlooked.
当時の私船(民間貿易)は、倭寇に代表される手荒い貿易方法で、元(王朝)の衰退を惹起させる程のもので看過できないものであった。