The convoy,which included carrying 500 metric tons of food rations, was targeted by roadside bombs and mortar fire.

VOA: standard.2009.09.12

He was very famous when I was in graduate school tons and tons of years ago.

我读研究生时他已经非常有名了,多少年前了

耶鲁公开课 - 聆听音乐课程节选

Magnesium was 60,000 tons.

镁的产量为每年6万吨。

麻省理工公开课 - 固态化学导论课程节选

Economists say India's purchase of 200 tons of gold shows that the country has come a long way in the two decades since it was on the verge of defaulting on its international debt.

VOA: standard.2009.11.06