What they lacked in speed those pioneer pilots made up for by flying only a few feet above the ground.那些飞行员先驱通过离地仅几英尺的低空飞行，弥补了飞行速度的不足。There are clear differences in speed of learning between infants at this early stage.这个阶段的婴儿虽然都还很小，但在学习速度上已有了明显的差别。What he lacks in speed he makes up for in strength.他的力量弥补了他速度的不足。