Parts per Billion

十億分比（parts per billion，ppb），定義為十億分之一。1ppb 即是十億分之一。 1 p p b = 1 10 9 {\displaystyle 1ppb={\frac {1}{10^{9}}}} 一【公斤】（kg）的物質中有一【微克】（ug）某物質，某物質含量即為1ppb。

than $100 million per year for construction within the United States. This largely closes the loophole Trump tried to use to fund parts of his border wall

¥337.81 billion (4233 million美元) 2001–2002 – ¥61.16 billion 2003 – ¥39.61 billion 2004 – ¥35.8 billion 2005 – ¥44.76 billion 2006 – ¥29.15 billion 2007 –

functions. During his tenure, PayPal grew payment volume from zero to $3.5 billion per year and revenue from zero to over $100 million in 2001. The company

Average Over $4 Billion Per Launch [...] We project the cost to fly a single SLS/Orion system through at least Artemis IV to be $4.1 billion per launch at a