1.laid down 貯藏;沉積
Every year we burn what nature laid down over a million years.
我們每年燃燒的都是大自然貯藏了一百萬(wàn)年的東西。
2.flock to 聚集到
People flocked to Beijing to see the athletic meeting.
人們成群地到北京去看運(yùn)動(dòng)會(huì)。
3.wear down 磨損;磨平
The point of the pencil had been worn down when I finished this letter.
寫(xiě)完這封信時(shí)鉛筆已經(jīng)磨得很短了。