II.off [美 ɔf, ɑf, 英 ɒf]副off often appears as the second element of certain verb structures in English (break off, pay off, take off, etc). For translations, see the relevant verb entry (break, pay, take, etc).
I.on [美 ɑn, ɔn, 英 ɒn]介词on often appears as the second element of certain verb structures in English (count on, lay on, sign on, etc). For translations, see the relevant verb entry (count, lay, sign, etc).
The scientific satellite had been expected to separate from the rocket at an altitude of 188 miles and deploy its solar panels about nine minutes after blast-off.
And since the blast-off in online shopping, customers are much more familiar with what is in each shop and when, thanks to the extra browsing time afforded by the internet.