They find themselves surrounded,

他们发现自己被包围了
and Paris is--it's nothing like- -

巴黎成为巴黎已经大不如前
it's one-third the size of London at this same time,

它仅仅相当于
or at any other time,

当时或其他时期伦敦规模的三分之一
but it has a huge circumference.

还是一个巨大的牢笼
There is a wall around Paris and there are exterior forts,

在巴黎外围高墙林立堡垒遍地
but you've got an enormous number of people

但仍有大批民众
besieged by Prussian and other German forces, holding on.

在普鲁士和其他德国军队的围攻中坚守阵地
At one point, a French politician whom you'll meet in the textbook,

你们在课本上会看到一位
at least, called Gambetta, who died very young,

英年早逝的法国政治家名叫甘贝塔
flies away in a balloon,

一次乘着热气球飞离巴黎
flies down toward Tours on the Loire Valley

飞到了卢瓦尔河河谷的图尔