例句：
His aim was to become president.
他的目的是當(dāng)總統(tǒng)。
We aim to help the poorest families.
我們的目標(biāo)是接濟(jì)最貧困的家庭。
Draughts help to circulate air.
通風(fēng)有助于循環(huán)空氣。
Loud screams rent the air.
高聲的尖叫劃破了天空。
His hands clawed the air.
他的雙手在空中亂抓。