1. at the helm of a state : 掌握着政权；
名词
1. 舵柄;舵轮
The helm of a boat or ship is the part that is used to steer it.
2. （政府或组织中的）领导位置
You can say that someone is at the helm when they are leading or running a country or organization.
1. a position of leadership
e.g. the President is at the helm of the Ship of State
2. steering mechanism for a vessel
a mechanical device by which a vessel is steered