But the medicine in Bangladesh was produced by a local drug manufacturer that used a dangerous substitute to save money.

VOA: special.2010.02.22

The study found that blood from hair sheep is an excellent substitute.

VOA: special.2009.08.03

"But when you're trying to deal with processes and technical terms on the aircraft, there's no substitute for speaking the same language."

VOA: standard.2009.12.13