They 're more easily noticed than a command shouted through a bullhorn .
它们比用电动扩音器喊命令再容易引起注意。
Another marcher switched targets when it was his turn at the bullhorn .
轮到另一名游行者使用扩音器时，他转换了目标。
But congress , lacking the presidential bullhorn , is a much less effective policymaking instrument than the white house , as mr gingrich eventually discovered .
