短语词组短语helm a port 左舵put the helm to port 把舵转向左舷helm port signal 舵角信号helm port stock 舵柄helm port transon 舵杆孔加强材helm port roof 尖屋顶helm port transom 舵杆孔加强材helm port wind 舵轮风port helm 里舵 返回 helmport