名词
中文翻译：十亿分之一克
同义词：
['sub-picogram', 'picogram例句：1. The scientist used a subpicogram of the drug to test its effectiveness.（科学家用微量的这种药物来测试其效果。）']
例句：
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1. The scientist used a subpicogram of the drug to test its effectiveness.
科学家用微量的这种药物来测试其效果。
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2.The amount of sugar in this drink is just under a subpicogram.
这个饮料中的糖含量不到一个微克。
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3.The new drug has a subpicogram of toxicity per milligram, which is very low.
这种新药每毫克的毒性只有微克级别，非常低。