Beijing,which has extensive trade and economic ties with Tehran, has been reluctant to press for new sanctions.

VOA: standard.2010.05.25

which is basically an extensive number of classes that everybody has to take if you're in Columbia College,

基本包含了大量的课，而且每个哥伦比亚的学生都要上，

哥伦比亚大学的教程 - SpeakingMax英语口语达人

There has also been extensive flooding in the southeastern part of Iceland as parts of a glacier were melted by the volcano.

VOA: standard.2010.04.15

The Pakistani government has made extensive preparations to prevent Monday's protest rally in downtown Islamabad.

VOA: standard.2009.03.14

But the torrential rains have not stopped. They are expected to continue for several more weeks, enough time to add to the already extensive damage that has occurred.

VOA: standard.2009.09.05