1. She does not know the gravity of her illness.
    她不知道自己病情严重。

2. gravity

2. He could hardly keep his gravity.
    他忍不住要笑出来。

3. The stone rolled down the hill by gravity.
    石头在重力作用下向山下滚去。

4. Anything that is dropped falls towards the centre of the earth because of the pull of gravity.
    物体脱手即向地心方向跌落是由于重力吸引的缘故。

1. 重力：把所涉的力称作推力(impulse)、引力(vis attractive)、拖曳力(vis tractoria)、重力(gravity)、活力(vis viva)还是物体的某种固有的倾向,体现了作者对世界的不同看法,对物理世界的不同理解.

2. gravity的反义词

2. [重力场]：本例中烟的设定只是一种最简单的设置,用户还可以根据需要将本例中的粒子改用喷射粒子以及给粒子增加动力场--如空气场(air)、振荡场(turbulence)、重力场(gravity)等手段得到更好的效果.

1. 重力；地球引力
    Gravity is the force which causes things to drop to the ground.

    e.g. Arrows would continue to fly forward forever in a straight line were it not for gravity, which brings them down to earth.
           要不是重力使箭落向地面，它们将永远以直线往前飞行。

2. （事态的）严重性，重大
    The gravity of a situation or event is its extreme importance or seriousness.

    e.g. They deserve punishment which matches the gravity of their crime...
           应当根据罪行的严重性来惩治他们。
    e.g. Not all acts of vengeance are of equal gravity.
           并非所有的报复行为都同等恶劣。

3. （言谈举止的）庄重，严肃
    The gravity of someone''s behaviour or speech is the extremely serious way in which they behave or speak.

gravity的反义词

    e.g. There was an appealing gravity to everything she said.
           她说的每句话都带着一种庄严，很能吸引人。