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。