on nov.18th
问题描述：
on nov.18th
Soon they heard the sea.They were carrying the usual rope(绳子),and it was hanging down from the basket of the balloon.At the end of the rope they had tied a metal box.This could hold water,or it could be empty.So they were able to change its weight(重量).It was for use over the sea.They were also carrying some bags of sand.
答
不久他们听到大海.他们携带着普通的绳子,从热气球上把绳子悬挂下来,绳子的另一端系着一个金属箱子.这里可以装满水,也可是空的.所以他们可以改变它的重量.这是用来飞越大海的.他们也可以携带一些沙包.
凑合看吧,大概意思.