2. I know my
gramme(English/Chinese)are very bad, but I will try, and hope everyone can help.
不论是中文还是英文,我的文法都一样很差。不过,我会尽力去尝试,也希望各位能帮忙。
3. It was found in concentrations of 29 to 850 pico
grammes per cubic metre of air. A micro
gramme is one trillionth of a
gramme.
每立方空气中含有29到850微微克浓度。一微微克是一克的万亿分之一。