Billions of dollars each year are spent on schools and libraries.(每年有數(shù)十億美元花在建設(shè)學(xué)校和圖書館上。)

Drug companies have spent billions of dollars searching for therapies to reverse or significantly slow Alzheimer's disease, but in vain.(醫(yī)藥公司已經(jīng)花費(fèi)數(shù)十億美元以尋找能逆轉(zhuǎn)或顯著減緩阿爾茨海默病的治療方法，但毫無結(jié)果。)

Astrogeologists suspect that these scarps having formed billions of years ago as the planet's surface cooled and shrank.(太空地質(zhì)學(xué)家猜測(cè)這些陡坡是在幾十億年前當(dāng)行星表面冷卻收縮時(shí)開始形成的。)

The country owes billions of dollars to foreign creditors.(這個(gè)國(guó)家欠外國(guó)債權(quán)人數(shù)十億元。)

She faces charges of helping to plunder her country's treasury of billions of dollars.(她面臨協(xié)從竊取國(guó)庫(kù)中數(shù)十億美元的指控。)

They have these special organs that collect the hydrogen sulfide and carbon dioxide and then transfer it to another organ, where billions of bacteria live.(他們有這些特殊的器官來收集硫化氫和二氧化碳，然后把它們轉(zhuǎn)移到另一個(gè)器官，那里有數(shù)十億的細(xì)菌。)

The insurance industry will pay out billions of dollars for damage caused by Hurricane Katrina.(保險(xiǎn)業(yè)將為卡特里娜颶風(fēng)造成的損失賠付數(shù)十億美元。)

It would seem sensible to seek the source of these in the universe's most conspicuous energy factories: quasars and gamma-ray bursts billions of light-years away from Earth.(在宇宙中最引人注目的能量工廠——距離地球數(shù)十億光年的類星體和伽馬射線爆發(fā)——中尋找這些物質(zhì)的來源似乎是明智的。)

We are the products of evolution, and not just evolution that occurred billions of years ago.(我們是進(jìn)化的產(chǎn)物，并且不僅僅是發(fā)生在數(shù)十億年前的進(jìn)化。)

Over billions of years, the gas was compressed by gravity into galaxies, stars, plants and eventually, even humans.(在數(shù)十億年的時(shí)間里，這些氣體被引力壓縮成星系、恒星、植物，最終甚至變成了人類。)