The half-life of the drug is approximately 4 hours.

这种药物的半衰期大约是4小时。

The half-life of this radioactive substance is 30 years.

这种放射性物质的半衰期是30年。

Knowing the half-life helps in determining the dosage of medication.

了解半衰期有助于确定药物的剂量。

Scientists measure the half-life to understand the decay process.

科学家们测量半衰期以了解衰变过程。

The half-life of carbon-14 is used in radiocarbon dating.

碳-14的半衰期被用于放射性碳定年法。

And again, the half-life is always useful.

半衰期是很有用的。

Business opportunities have a half-life, just like uranium.

商业机会有半衰期，就像铀一样。

The elimination half-life of propofol in brain were (9.

测定脑组织中的普鲁泊福消除半衰期。

Tritium has a half - life of 12.4 years.

氚的半衰期为12.4年,地球形成时的氚早已不存在.

So, the half-life is just the time that it takes for half of the reactants to disappear.

半衰期实际上是,一半反应物消失的时间。