Femtogram
毫微微克(10的-15次方克)
🗣️ 情景例句
Unless in uniform, he doesn't look like a policeman.
除非穿上制服，要不他看起来不像警察。
Have you heard from Marry?
你收到玛丽的来信吗？
Of all the planets in our own solar system,
在我们太阳系的所有行星中，