Vertically-movable, transmission-friendly, and controllable stroller

A vertically-movable, transmission-friendly, and controllable stroller, comprising:

• a front wheel component comprising a front wheel hanger, a front lateral right wheel mounted on a bottom of the front wheel hanger, and a front lateral left wheel mounted on the bottom of the front wheel hanger;
• a rear wheel component comprising a rear wheel hanger, a rear lateral right wheel mounted on a bottom of the rear wheel hanger, and a rear lateral left wheel mounted on the bottom of the rear wheel hanger;
• a frame comprising a front lateral subframe, a rear lateral subframe, a right lateral subframe and a left lateral subframe, the front lateral subframe having a bottom pivotally connected to the front wheel component, the rear lateral subframe not only having a bottom pivotally connected to the rear wheel component but also connecting to a handle extending toward a rear of the rear lateral subframe, the right lateral subframe comprising a right lateral top tube, a right lateral chassis, a front right lateral upright tube and a rear right lateral upright tube, and the left lateral subframe comprising a left lateral top tube, a left lateral chassis, a front left lateral upright tube and a rear left lateral upright tube;
• and
• a rail component comprising a front right rail and a rear right rail, with the front right and rear right rails disposed on the front right lateral upright tube and the rear right lateral upright tube respectively, allowing left and right ends of the right lateral top tube to be vertically slidingly connected between the front right lateral upright tube and the rear right lateral upright tube,
• wherein the front right rail and the rear right rail have thereon a front right slider and a rear right slider respectively, allowing the left and right ends of the right lateral top tube to be fixed to the front right slider and the rear right slider by a front right locking structure and a rear right locking structure respectively.