放射性样品选择得很巧妙，假使一个小时之后，衰减的可能性为五十比五十。
The sample is chosen so that after, say, one hour, there stands a fifty-fifty chance of a decay occurring.
给出了一种用室内快速运动的球体作为放射性样品测量室内氡射气辐射活度的新方法。
A new method of measuring indoor radioactivity of radon is presented by using the indoor fast-moving ball as the sample of a radioactive substance.
所以，在这里，我们只能说，放射性样品衰老可能的速率有一个范围，如果有一个衰老的真正极小速率，那么该范围仍然应当包括零。
So here, we can only say that there is a range of possible rates of senescence of the radioactive sample, and if there is a really tiny rate of senescence, that range would still include zero.
应用推荐