On Earth, polycyclic aromatic hydrocarbons are found on burnt toast and in automobile exhaust.
On Earth, polycyclic aromatic hydrocarbons are found on burnt toast and in automobile exhaust.
在地球上，可以在烤土司和汽车尾气中找到多环芳烃。
On Earth, polycyclic aromatic hydrocarbons are found on burnt toast and in automobile exhaust.
在地球上，可以在烤土司和汽车尾气中找到多环芳烃。