千万: 1.(一千个万) ten million; millions upon millions2.(务必) be sure to; do 短语和例子这事你千万记着。 be sure to bear this in mind. 千万要小心啊! do be careful! 这事儿千万不可掉以轻心。 we must under no circumstances take this l
The technique is so sensitive that it can detect a single radioactive carbon atom hiding among a quadrillion ( one million billion ) ordinary ones 这项技术非常敏感，甚至能够在十的十五次方（一千万亿）个普通碳原子中找到一个放射性碳原子。
