A lot of that money is for international roaming charges.

很多都是国际漫游费用。

Hackers do it to stop roaming charges.

黑客这么做用来阻止漫游费。

Why do you have roaming charges?

为什么要收漫游费？

The scientists thus had to pay data roaming charges. These are the charges you pay to use your mobile phone in other countries.

因此科学家们不得不支付数据漫游费，这些是你在其他国家使用手机所支付的费用。