''The global security firm CompuDyne is one of the biggest and most successful security companies in the world, which produces prison equipment and surveillance gear and helps protect government buildings against terrorism. After the 1998 bombings of two U.S. embassies in Africa, CompuDyne’s business supplying blast-resistant windows and doors to most of the embassies around the world doubled. After the terrorist attack on the U.S.S. Cole in 2000, the company was hired to provide shoreline protection for the U.S. ''. cho mình hỏi trong đoạn văn này tại sao câu ''After the 1998 bombings of two U.S. embassies in Africa, CompuDyne’s business supplying blast-resistant windows and doors to most of the embassies around the world doubled'' không có động từ ạ??????