但是这些数词如果前面没有具体数字，就用复数形式后接of，如：hundreds of 数以百计的，thousands of 成千上万的，millions of 数以百万计的，billions of 数以十亿计的，trillions of 数以兆计的，quadrillions of 数以千兆计的。
When converting between millions and billions, it is important to understand the concept of powers of ten. A billion is equal to 1,000 million, or 1,000,000,000. To convert millions to billions, one can divide the number of millions by 1,000. For example, 500 million is equal to 0.5...