Naphthoquinoxaline
1, 4-二氮雜蒽
??? 情景例句
This is a little difficult for her.
這對她來說有點(diǎn)不習(xí)慣。
What do you mean? not at all!
哪有？
The price includes postage charges.
價(jià)格包括郵資在內(nèi)。