許多專家以為今年全球經濟會好轉，但隨著伊拉克戰爭開打以及 SARS（重急性呼吸道症候群）的爆發，一切都成了未知數。 這句話的英文怎麼說？ (學習英語會話)

Many experts thought that the global economy would improve this year, but with the start of war in Iraq and the outbreak of SARS, all bets are off.