例句：
His aim was to become president.
他的目的`是当总统。
We aim to help the poorest families.
我们的目标是接济最贫困的家庭。
Draughts help to circulate air.
通风有助于循环空气。
Loud screams rent the air.
高声的尖叫划破了天空。
His hands clawed the air.
他的双手在空中乱抓。
例句：
His aim was to become president.
他的目的`是当总统。
We aim to help the poorest families.
我们的目标是接济最贫困的家庭。
Draughts help to circulate air.
通风有助于循环空气。
Loud screams rent the air.
高声的尖叫划破了天空。
His hands clawed the air.
他的双手在空中乱抓。