If you would hit the mark, you must aim a little above it; Every arrow that flies feels the attraction of earth.

If you would hit the mark, you must aim a little above it; Every arrow that flies feels the attraction of earth.

要想射中靶，必须瞄准比靶略为高些;飞的箭都受到地心引力的影响。

-- Henry Wadsworth Longfellow 朗费罗