Arrows would continue to fly forward forever in a straight line were it not for gravity, which brings them down to earth.

要不是重力使箭掉落地上，它将会一直沿直线往前飞行。

The president said those who grab power through violence deserve punishment which matches the gravity of their crime.

总统说那些通过暴力攫取权力的人应当根据其罪行的严重程度受到相应的惩罚。

There was an appealing gravity to everything she said.

她所说的一切都带有一种吸引人的庄严。