An average teenage girl produces around half a milligram of testosterone per day .

一个平均年龄的少女每天约产生半毫克的睾丸酮。

Weighing just a milligram and protected only by a thin exoskeleton , the fruit fly lives in constant danger of being squashed .

果蝇体重只有1毫克，只有一层薄薄的外骨骼为其提供保护，因此果蝇时常生活在被压扁的危险之中。

Powered by 0.7 milligram of radioactive curium 244 , apxs irradiates samples with alpha particles ( nuclei of helium atoms ) and x-rays to make sensitive measurements of chemical makeup .

由0.7毫克的放射性锔244驱动，apxs利用α粒子（氦原子的原子核）和x-射线撞击样品使之产生可以被测量的化学成分。

It must be the consumer who decides whether or not alli represents value for money at 50 for a month 's course , but ask yourself this ; why does it cost three times as much , milligram for milligram , as the prescription version ?

只有消费者才能决定艾莉是否真的值50美元一个月疗程，但是问问你自己：为什么一旦作为处方药，它每毫克的价钱就上涨了三倍？